:root {
  --bg: #f5f6fa;
  --bg-alt: #ffffff;
  --bg-soft: #eceef6;
  --text: #1a1a2e;
  --text-soft: #4a4d63;
  --text-mute: #7a7e96;
  --primary: #e94560;
  --primary-dark: #c92f4c;
  --accent: #6c5ce7;
  --accent-2: #00c2a8;
  --border: rgba(26, 26, 46, 0.12);
  --card: #ffffff;
  --glass: rgba(255, 255, 255, 0.72);
  --glass-strong: rgba(255, 255, 255, 0.9);
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 28px rgba(26, 26, 46, 0.1);
  --shadow-lg: 0 18px 50px rgba(26, 26, 46, 0.16);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --grad-hero: linear-gradient(135deg, #1a1a2e 0%, #2d1b4e 38%, #6c5ce7 72%, #e94560 100%);
  --grad-btn: linear-gradient(135deg, #e94560 0%, #ff6b81 100%);
  --grad-soft: linear-gradient(135deg, rgba(108, 92, 231, 0.12), rgba(233, 69, 96, 0.1));
  --header-h: 72px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.32s var(--ease);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f1a;
    --bg-alt: #161827;
    --bg-soft: #1c1f33;
    --text: #eef0f8;
    --text-soft: #b9bdd4;
    --text-mute: #8b90ab;
    --primary: #ff5c78;
    --primary-dark: #e94560;
    --accent: #8b7bff;
    --accent-2: #2be0c6;
    --border: rgba(255, 255, 255, 0.12);
    --card: #171a2b;
    --glass: rgba(23, 26, 43, 0.66);
    --glass-strong: rgba(23, 26, 43, 0.88);
    --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 50px rgba(0, 0, 0, 0.6);
    --grad-hero: linear-gradient(135deg, #0b0c16 0%, #1c1233 38%, #4b3fb0 70%, #b52d48 100%);
    --grad-soft: linear-gradient(135deg, rgba(139, 123, 255, 0.16), rgba(255, 92, 120, 0.12));
  }
}

*,
*::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: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(108, 92, 231, 0.1), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(233, 69, 96, 0.09), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(0, 194, 168, 0.07), transparent 46%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

h1, h2, h3, h4 {
  line-height: 1.35;
  color: var(--text);
  letter-spacing: 0.01em;
}

h1 {
  font-size: clamp(1.65rem, 4.2vw, 2.75rem);
  font-weight: 800;
  margin: 0 0 1rem;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
  font-weight: 800;
  margin: 0 0 1.2rem;
  position: relative;
  padding-bottom: 0.85rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--grad-btn);
  box-shadow: 0 2px 12px rgba(233, 69, 96, 0.4);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 700;
  margin: 1.8rem 0 0.7rem;
}

p {
  margin: 0 0 1rem;
  color: var(--text-soft);
}

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

ul, ol {
  margin: 0 0 1.2rem;
  padding-left: 1.4rem;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.5rem;
}

blockquote {
  margin: 1.6rem 0;
  padding: 1.1rem 1.4rem;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0 0 0.6rem;
  font-style: italic;
  color: var(--text-soft);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ---------- Header ---------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-strong);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0.6rem 1.25rem;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex-shrink: 0;
}

.brand > a {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
}

.brand svg {
  flex-shrink: 0;
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.28);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand > a:hover svg {
  transform: rotate(-6deg) scale(1.06);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.45);
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(120deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-slogan {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

#main-nav {
  margin-left: auto;
}

#main-nav ul {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
  flex-wrap: wrap;
}

#main-nav li {
  margin: 0;
}

#main-nav a {
  position: relative;
  display: inline-block;
  padding: 0.45rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
  border-radius: 10px;
  transition: color var(--transition), background var(--transition);
}

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

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--primary);
  background: var(--grad-soft);
}

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

#menu-toggle {
  display: none;
  margin-left: auto;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-btn);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(233, 69, 96, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
}

#menu-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(233, 69, 96, 0.5);
}

/* ---------- Hero ---------- */
#hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3rem, 8vw, 6rem) 1.25rem clamp(2.5rem, 6vw, 4.5rem);
  background: var(--grad-hero);
  color: #fff;
  isolation: isolate;
}

#hero::before,
#hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  z-index: -1;
  animation: floatBlob 14s ease-in-out infinite alternate;
}

#hero::before {
  width: 420px;
  height: 420px;
  top: -140px;
  left: -100px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.75), transparent 68%);
}

#hero::after {
  width: 480px;
  height: 480px;
  bottom: -200px;
  right: -120px;
  background: radial-gradient(circle, rgba(0, 194, 168, 0.6), transparent 68%);
  animation-delay: -6s;
}

@keyframes floatBlob {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(40px, 30px, 0) scale(1.12); }
}

.hero-inner {
  max-width: 1080px;
  margin: 0 auto;
  text-align: center;
  animation: fadeUp 0.9s var(--ease) both;
}

#hero-title {
  color: #fff;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.35);
  animation: fadeUp 0.9s var(--ease) 0.08s both;
}

.hero-lead {
  max-width: 880px;
  margin: 0 auto 2rem;
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  line-height: 1.95;
  color: rgba(255, 255, 255, 0.86);
  animation: fadeUp 0.9s var(--ease) 0.16s both;
}

.hero-lead strong {
  color: #fff;
  background: linear-gradient(120deg, #ffd76e, #ff8fa3);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.6rem;
  animation: fadeUp 0.9s var(--ease) 0.24s both;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 160px;
  padding: 0.85rem 1.9rem;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn-primary {
  color: #fff;
  background: var(--grad-btn);
  box-shadow: 0 10px 28px rgba(233, 69, 96, 0.45);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #fff;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 38px rgba(233, 69, 96, 0.6);
}

.btn-secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.24);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.3);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 1.4rem 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  animation: fadeUp 0.9s var(--ease) 0.32s both;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.stat:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}

.stat-num {
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 2px 18px rgba(233, 69, 96, 0.6);
}

.stat-num::after {
  content: "+";
  font-size: 0.6em;
  margin-left: 2px;
  color: #ffd76e;
}

.stat:nth-child(3) .stat-num::after {
  content: "%";
}

.stat:nth-child(4) .stat-num::after {
  content: "×24";
  font-size: 0.5em;
}

.stat-label {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- Breadcrumb ---------- */
#breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem 0;
}

#breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
  color: var(--text-mute);
}

#breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

#breadcrumb li + li::before {
  content: "›";
  color: var(--text-mute);
  opacity: 0.7;
}

#breadcrumb a {
  color: var(--text-soft);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}

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

#breadcrumb [aria-current="page"] {
  color: var(--primary);
  font-weight: 700;
}

/* ---------- Main sections ---------- */
main {
  display: block;
}

main > section {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) 1.25rem;
}

main > section > h2 {
  margin-top: 0;
}

/* Card-like sections */
#intro,
#about,
#products,
#solutions,
#scenarios,
#cases,
#howto,
#articles,
#knowledge,
#faq,
#notice,
#contact,
#sitemap,
#links {
  position: relative;
}

#intro,
#about,
#products,
#solutions,
#scenarios,
#cases,
#howto,
#knowledge,
#notice,
#contact {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-top: 2rem;
  margin-bottom: 2rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

#intro:hover,
#about:hover,
#products:hover,
#solutions:hover,
#scenarios:hover,
#cases:hover,
#howto:hover,
#knowledge:hover,
#notice:hover,
#contact:hover {
  box-shadow: var(--shadow-lg);
}

#intro {
  background: var(--card);
  background-image: var(--grad-soft);
}

/* ---------- Articles ---------- */
#articles {
  background: transparent;
}

#articles > p {
  max-width: 860px;
}

#articles article {
  position: relative;
  margin: 0 0 1.4rem;
  padding: 1.5rem 1.6rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#articles article::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--grad-btn);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#articles article:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(233, 69, 96, 0.35);
}

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

#articles article h3 {
  margin-top: 0;
  font-size: 1.12rem;
  transition: color var(--transition);
}

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

#articles .meta {
  margin-bottom: 0.8rem;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  color: var(--text-mute);
}

#articles article > a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--grad-soft);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

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

#articles article > a:hover {
  background: var(--grad-btn);
  color: #fff;
  transform: translateX(3px);
}

#articles article > a:hover::after {
  transform: translateX(3px);
}

/* ---------- FAQ ---------- */
#faq details {
  margin-bottom: 0.85rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}

#faq details[open] {
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-md);
  background: linear-gradient(180deg, var(--card), var(--bg-soft));
}

#faq summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 1rem 3rem 1rem 1.35rem;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text);
  transition: color var(--transition), background var(--transition);
  user-select: none;
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.2rem;
  top: 50%;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  color: #fff;
  background: var(--grad-btn);
  border-radius: 50%;
  transform: translateY(-50%);
  transition: transform var(--transition), background var(--transition);
}

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

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

#faq details > p {
  margin: 0;
  padding: 0 1.35rem 1.25rem;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--text-soft);
  animation: fadeUp 0.4s var(--ease) both;
}

/* ---------- Contact ---------- */
#contact ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

#contact li {
  margin: 0;
  padding: 0.85rem 1.1rem;
  font-size: 0.92rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#contact li:hover {
  transform: translateY(-3px);
  border-color: rgba(233, 69, 96, 0.4);
  box-shadow: var(--shadow-sm);
}

#contact li a {
  font-weight: 700;
}

/* ---------- Sitemap & Links ---------- */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.65rem;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 0.7rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(233, 69, 96, 0.35);
}

#links > p {
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--text-mute);
}

/* ---------- Footer ---------- */
#site-footer {
  margin-top: 3rem;
  background: var(--grad-hero);
  color: rgba(255, 255, 255, 0.82);
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 194, 168, 0.3), transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(2rem, 4vw, 3.2rem) 1.25rem 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.footer-inner p {
  margin: 0 0 0.55rem;
  font-size: 0.86rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.72);
}

.footer-inner strong {
  color: #fff;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
}

.footer-brand p:first-child {
  margin-bottom: 0.7rem;
}

.footer-legal a {
  color: #ffd76e;
  font-weight: 600;
}

.footer-legal a:hover {
  color: #fff;
  text-decoration: underline;
}

#privacy,
#disclaimer {
  font-size: 0.8rem !important;
  color: rgba(255, 255, 255, 0.6) !important;
}

/* ---------- Back to top ---------- */
#back-to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.4rem;
  z-index: 90;
  padding: 0.7rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-btn);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(233, 69, 96, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
}

#back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(233, 69, 96, 0.6);
}

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

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

main > section,
#articles article,
#faq details {
  animation: fadeUp 0.7s var(--ease) both;
}

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

@supports (animation-timeline: view()) {
  main > section,
  #articles article,
  #faq details {
    animation: fadeUp linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 28%;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .header-inner {
    gap: 0.9rem;
  }

  #main-nav a {
    padding: 0.4rem 0.55rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 860px) {
  #menu-toggle {
    display: inline-flex;
  }

  #main-nav {
    width: 100%;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.45s var(--ease), opacity 0.35s var(--ease);
  }

  #main-nav.is-open {
    max-height: 520px;
    opacity: 1;
  }

  #main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0.2rem;
    padding: 0.5rem 0 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 0.4rem;
  }

  #main-nav a {
    display: block;
    padding: 0.65rem 0.9rem;
    font-size: 0.92rem;
    border-radius: var(--radius-sm);
  }

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

  .hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #hero {
    padding-top: 2.6rem;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15px;
    line-height: 1.75;
  }

  .header-inner {
    padding: 0.55rem 1rem;
  }

  .brand-name {
    font-size: 1.12rem;
  }

  .brand-slogan {
    font-size: 0.66rem;
  }

  main > section {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  #intro,
  #about,
  #products,
  #solutions,
  #scenarios,
  #cases,
  #howto,
  #knowledge,
  #notice,
  #contact {
    border-radius: var(--radius);
    margin-top: 1.2rem;
    margin-bottom: 1.2rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .hero-stats {
    padding: 1rem 0.6rem;
    gap: 0.6rem;
  }

  .stat-num {
    font-size: 1.45rem;
  }

  .stat-label {
    font-size: 0.72rem;
  }

  #articles article {
    padding: 1.15rem 1.1rem;
  }

  #faq summary {
    padding: 0.9rem 2.8rem 0.9rem 1.1rem;
    font-size: 0.92rem;
  }

  #faq details > p {
    padding: 0 1.1rem 1.1rem;
    font-size: 0.88rem;
  }

  #contact ul,
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    right: 0.9rem;
    bottom: 1rem;
    padding: 0.6rem 0.95rem;
    font-size: 0.76rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }
}

/* ---------- Reduced motion ---------- */
@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;
  }
}

/* ---------- Print ---------- */
@media print {
  #site-header,
  #back-to-top,
  #hero::before,
  #hero::after {
    display: none !important;
  }

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

  #hero,
  #site-footer {
    background: none;
    color: #000;
  }
}