:root {
  --brand-primary: #F5A623;
  --brand-primary-dark: #D98C0A;
  --brand-secondary: #FF6B6B;
  --brand-accent: #7C5CFF;
  --gradient-brand: linear-gradient(135deg, #F5A623 0%, #FF6B6B 55%, #7C5CFF 100%);
  --gradient-soft: linear-gradient(135deg, rgba(245, 166, 35, 0.14) 0%, rgba(124, 92, 255, 0.12) 100%);
  --gradient-banner: linear-gradient(120deg, #1B1035 0%, #2A1A4A 40%, #3B1E3F 100%);
  --bg-body: #F7F5F1;
  --bg-elevated: #FFFFFF;
  --bg-muted: #F0EDE7;
  --bg-glass: rgba(255, 255, 255, 0.62);
  --bg-glass-strong: rgba(255, 255, 255, 0.82);
  --border-soft: rgba(27, 16, 53, 0.08);
  --border-glass: rgba(255, 255, 255, 0.55);
  --text-primary: #1B1035;
  --text-secondary: #4A4360;
  --text-muted: #7A7390;
  --text-inverse: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(27, 16, 53, 0.06);
  --shadow-md: 0 10px 28px rgba(27, 16, 53, 0.10);
  --shadow-lg: 0 22px 54px rgba(27, 16, 53, 0.16);
  --shadow-glow: 0 16px 40px rgba(245, 166, 35, 0.28);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --max-width: 1180px;
  --transition-fast: 0.18s ease;
  --transition-base: 0.32s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-body: #0E0A1A;
    --bg-elevated: #17112B;
    --bg-muted: #1E1735;
    --bg-glass: rgba(23, 17, 43, 0.62);
    --bg-glass-strong: rgba(23, 17, 43, 0.85);
    --border-soft: rgba(255, 255, 255, 0.08);
    --border-glass: rgba(255, 255, 255, 0.12);
    --text-primary: #F4F1FA;
    --text-secondary: #C9C3DE;
    --text-muted: #8E87A8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 28px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 22px 54px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 16px 40px rgba(245, 166, 35, 0.18);
    --gradient-banner: linear-gradient(120deg, #0B0618 0%, #1A0E33 45%, #2A1230 100%);
    --bg-glass: rgba(23, 17, 43, 0.55);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--bg-body);
  background-image:
    radial-gradient(circle at 12% 0%, rgba(245, 166, 35, 0.10), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(124, 92, 255, 0.10), transparent 46%),
    radial-gradient(circle at 50% 100%, rgba(255, 107, 107, 0.07), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--brand-primary-dark);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

a:hover,
a:focus-visible {
  color: var(--brand-secondary);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(245, 166, 35, 0.55);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

p {
  margin: 0 0 var(--space-4);
  color: var(--text-secondary);
}

ul,
ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.35em;
  color: var(--text-secondary);
}

li {
  margin-bottom: var(--space-2);
}

li::marker {
  color: var(--brand-primary);
  font-weight: 700;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--space-3);
  color: var(--text-primary);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.85rem, 1.2rem + 3.2vw, 3.1rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.4rem, 1.05rem + 1.6vw, 2.1rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  box-shadow: 0 0 18px rgba(245, 166, 35, 0.45);
}

h3 {
  font-size: clamp(1.1rem, 0.98rem + 0.55vw, 1.35rem);
  color: var(--text-primary);
}

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

::selection {
  background: rgba(245, 166, 35, 0.32);
  color: var(--text-primary);
}

/* ============ Header / Brand Bar ============ */

header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--border-glass);
  box-shadow: 0 6px 24px rgba(27, 16, 53, 0.07);
}

.brand-bar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5) var(--space-3);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
}

.brand-name {
  margin: 0;
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  position: relative;
}

.brand-name::after {
  content: "";
  position: absolute;
  inset: -6px -14px;
  border-radius: var(--radius-pill);
  background: var(--gradient-soft);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.brand-bar:hover .brand-name::after {
  opacity: 1;
}

.brand-slogan {
  margin: 0;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-soft);
  background: var(--bg-glass-strong);
  transition: color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.brand-bar:hover .brand-slogan {
  color: var(--brand-primary-dark);
  border-color: rgba(245, 166, 35, 0.4);
  transform: translateY(-1px);
}

/* ============ Navigation ============ */

nav[aria-label="主导航"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5) var(--space-3);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

nav[aria-label="主导航"]::-webkit-scrollbar {
  display: none;
}

nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

nav[aria-label="主导航"] li {
  margin: 0;
  flex: 0 0 auto;
}

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  color: var(--text-inverse);
  background: var(--gradient-brand);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ============ Main Layout ============ */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-8);
}

main > section {
  margin-bottom: var(--space-6);
  padding: var(--space-6);
  background: var(--bg-glass-strong);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  animation: rise-in 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

main > section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245, 166, 35, 0.28);
}

main > section > p:last-child,
main > section > ul:last-child,
main > section > ol:last-child {
  margin-bottom: 0;
}

/* ============ Breadcrumb ============ */

nav[aria-label="面包屑导航"] {
  margin-bottom: var(--space-5);
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 10px 18px;
  list-style: none;
  font-size: 0.85rem;
  background: var(--bg-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  color: var(--text-muted);
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin-right: var(--space-2);
  color: var(--brand-primary);
  font-weight: 700;
}

nav[aria-label="面包屑导航"] a {
  color: var(--text-secondary);
  font-weight: 600;
}

nav[aria-label="面包屑导航"] a:hover {
  color: var(--brand-primary-dark);
}

/* ============ Hero / Intro Banner ============ */

#intro {
  position: relative;
  overflow: hidden;
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--gradient-banner);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow-lg);
  color: var(--text-inverse);
  isolation: isolate;
}

#intro::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto auto;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 166, 35, 0.42) 0%, transparent 62%);
  filter: blur(18px);
  z-index: -1;
  animation: float-orb 14s ease-in-out infinite alternate;
}

#intro::after {
  content: "";
  position: absolute;
  inset: auto auto -45% -18%;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.42) 0%, transparent 64%);
  filter: blur(22px);
  z-index: -1;
  animation: float-orb 18s ease-in-out infinite alternate-reverse;
}

#intro h1 {
  color: #FFFFFF;
  text-shadow: 0 4px 26px rgba(0, 0, 0, 0.35);
  max-width: 20em;
  margin-bottom: var(--space-5);
}

#intro h1::after {
  content: "";
  display: block;
  width: 96px;
  height: 6px;
  margin-top: var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  box-shadow: 0 0 24px rgba(245, 166, 35, 0.65);
}

#intro p {
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(0.95rem, 0.9rem + 0.3vw, 1.06rem);
  max-width: 62ch;
}

#intro p:last-child {
  margin-bottom: 0;
}

/* ============ Brand Section ============ */

#brand h3 {
  margin-top: var(--space-5);
  padding-left: 14px;
  border-left: 4px solid var(--brand-primary);
  border-radius: 2px;
}

#brand h3:first-of-type {
  margin-top: var(--space-4);
}

/* ============ Products ============ */

#products p {
  max-width: 72ch;
}

#products h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--gradient-soft);
  border: 1px solid var(--border-soft);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#products h3::before {
  content: "◆";
  color: var(--brand-primary);
  font-size: 0.8em;
  flex: 0 0 auto;
}

#products h3:hover {
  transform: translateX(6px);
  border-color: rgba(245, 166, 35, 0.4);
  box-shadow: var(--shadow-sm);
}

#products h3:first-of-type {
  margin-top: var(--space-4);
}

/* ============ Solutions ============ */

#solutions h3 {
  margin-top: var(--space-5);
  padding-bottom: var(--space-2);
  border-bottom: 1px dashed var(--border-soft);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

#solutions h3:hover {
  color: var(--brand-primary-dark);
  border-color: rgba(245, 166, 35, 0.5);
}

#solutions h3:first-of-type {
  margin-top: var(--space-4);
}

/* ============ Scenarios ============ */

#scenarios {
  background: var(--gradient-soft);
}

#scenarios p {
  font-size: clamp(0.98rem, 0.94rem + 0.25vw, 1.08rem);
  line-height: 1.9;
  color: var(--text-secondary);
}

/* ============ Cases ============ */

#cases h3 {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#cases h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(124, 92, 255, 0.3);
}

#cases h3:first-of-type {
  margin-top: var(--space-4);
}

#cases p:not(:last-child) {
  padding-left: var(--space-4);
  border-left: 3px solid rgba(245, 166, 35, 0.35);
}

#cases p:last-child {
  margin-bottom: 0;
}

/* ============ News ============ */

#news {
  position: relative;
  overflow: hidden;
}

#news::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--gradient-brand);
}

#news p {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--bg-muted);
  border: 1px solid var(--border-soft);
}

/* ============ Articles ============ */

#articles > p {
  margin-bottom: var(--space-5);
}

#articles article {
  position: relative;
  margin-bottom: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-brand);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition-base);
}

#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245, 166, 35, 0.3);
}

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

#articles article:last-child {
  margin-bottom: 0;
}

#articles article h3 {
  margin-bottom: var(--space-2);
  transition: color var(--transition-fast);
}

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

#articles article p {
  margin-bottom: var(--space-2);
  font-size: 0.95rem;
}

#articles article p:first-of-type {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--brand-primary-dark);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  background: rgba(245, 166, 35, 0.14);
  margin-bottom: var(--space-3);
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--gradient-soft);
  border: 1px solid rgba(245, 166, 35, 0.28);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

#articles article a:hover {
  background: var(--gradient-brand);
  color: #FFFFFF;
  transform: translateX(4px);
  box-shadow: var(--shadow-glow);
}

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

/* ============ HowTo ============ */

#howto h3 {
  margin-top: var(--space-5);
  color: var(--brand-primary-dark);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

#howto h3::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient-brand);
  box-shadow: 0 0 12px rgba(245, 166, 35, 0.6);
  flex: 0 0 auto;
}

#howto h3:first-of-type {
  margin-top: var(--space-4);
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  position: relative;
  counter-increment: step;
  padding: var(--space-3) var(--space-4) var(--space-3) 64px;
  margin-bottom: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
  font-weight: 900;
  color: #FFFFFF;
  border-radius: 50%;
  background: var(--gradient-brand);
  box-shadow: 0 6px 16px rgba(245, 166, 35, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245, 166, 35, 0.3);
}

/* ============ FAQ ============ */

#faq h3 {
  position: relative;
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-5) var(--space-4) 52px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  cursor: default;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

#faq h3::before {
  content: "Q";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 900;
  color: #FFFFFF;
  border-radius: 8px;
  background: var(--gradient-brand);
}

#faq h3:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(245, 166, 35, 0.35);
}

#faq h3 + p {
  margin: calc(var(--space-4) * -1 + 4px) 0 var(--space-5);
  padding: var(--space-4) var(--space-5);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: var(--bg-muted);
  border: 1px solid var(--border-soft);
  border-top: none;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ============ Knowledge ============ */

#knowledge {
  background: var(--gradient-soft);
}

/* ============ Contact ============ */

#contact p {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

#contact p:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(245, 166, 35, 0.3);
}

#contact p:last-child {
  margin-bottom: 0;
}

#contact a {
  font-weight: 700;
}

/* ============ Sitemap & Links ============ */

#sitemap ul,
#links ul {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-3);
}

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

#sitemap a,
#links a {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#sitemap a:hover,
#links a:hover {
  transform: translateY(-3px);
  color: #FFFFFF;
  background: var(--gradient-brand);
  border-color: transparent;
  box-shadow: var(--shadow-glow);
}

/* ============ Legal ============ */

#legal h2 {
  margin-top: var(--space-5);
}

#legal h2:first-child {
  margin-top: 0;
}

#legal p {
  font-size: 0.95rem;
}

/* ============ Footer ============ */

footer[role="contentinfo"] {
  position: relative;
  margin-top: var(--space-6);
  padding: var(--space-7) var(--space-5) var(--space-6);
  text-align: center;
  color: rgba(255, 255, 255, 0.78);
  background: var(--gradient-banner);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(680px, 90%);
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-brand);
  box-shadow: 0 0 24px rgba(245, 166, 35, 0.6);
}

footer[role="contentinfo"] p {
  margin: 0 auto var(--space-2);
  max-width: var(--max-width);
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
}

footer[role="contentinfo"] p:last-child {
  margin-bottom: 0;
}

/* ============ Animations ============ */

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

@keyframes float-orb {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-40px, 30px, 0) scale(1.08);
  }
}

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

/* Staggered entrance for sequential blocks */
main > section:nth-of-type(1) { animation-delay: 0.02s; }
main > section:nth-of-type(2) { animation-delay: 0.06s; }
main > section:nth-of-type(3) { animation-delay: 0.10s; }
main > section:nth-of-type(4) { animation-delay: 0.14s; }
main > section:nth-of-type(5) { animation-delay: 0.18s; }
main > section:nth-of-type(6) { animation-delay: 0.22s; }
main > section:nth-of-type(7) { animation-delay: 0.26s; }
main > section:nth-of-type(8) { animation-delay: 0.30s; }
main > section:nth-of-type(9) { animation-delay: 0.34s; }
main > section:nth-of-type(10) { animation-delay: 0.38s; }
main > section:nth-of-type(11) { animation-delay: 0.42s; }
main > section:nth-of-type(12) { animation-delay: 0.46s; }
main > section:nth-of-type(13) { animation-delay: 0.50s; }
main > section:nth-of-type(14) { animation-delay: 0.54s; }
main > section:nth-of-type(15) { animation-delay: 0.58s; }
main > section:nth-of-type(16) { animation-delay: 0.62s; }
main > section:nth-of-type(17) { animation-delay: 0.66s; }
main > section:nth-of-type(18) { animation-delay: 0.70s; }

#articles article {
  animation: fade-up 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

#articles article:nth-of-type(1) { animation-delay: 0.04s; }
#articles article:nth-of-type(2) { animation-delay: 0.08s; }
#articles article:nth-of-type(3) { animation-delay: 0.12s; }
#articles article:nth-of-type(4) { animation-delay: 0.16s; }
#articles article:nth-of-type(5) { animation-delay: 0.20s; }
#articles article:nth-of-type(6) { animation-delay: 0.24s; }
#articles article:nth-of-type(7) { animation-delay: 0.28s; }
#articles article:nth-of-type(8) { animation-delay: 0.32s; }
#articles article:nth-of-type(9) { animation-delay: 0.36s; }
#articles article:nth-of-type(10) { animation-delay: 0.40s; }

/* ============ Responsive ============ */

@media (max-width: 900px) {
  :root {
    --space-6: 24px;
    --space-7: 36px;
    --space-8: 48px;
  }

  main {
    padding: var(--space-5) var(--space-4) var(--space-7);
  }

  main > section {
    padding: var(--space-5) var(--space-4);
    border-radius: var(--radius-lg);
  }

  #intro {
    padding: var(--space-6) var(--space-4);
    border-radius: var(--radius-lg);
  }

  .brand-bar {
    padding: var(--space-3) var(--space-4);
  }

  nav[aria-label="主导航"] {
    padding: 0 var(--space-4) var(--space-3);
  }

  nav[aria-label="主导航"] a {
    padding: 7px 13px;
    font-size: 0.85rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
    background-attachment: scroll;
  }

  .brand-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .brand-slogan {
    font-size: 0.78rem;
    padding: 3px 12px;
  }

  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  #intro {
    padding: var(--space-5) var(--space-4);
  }

  #intro h1::after {
    width: 68px;
    height: 5px;
  }

  main > section {
    padding: var(--space-4);
    border-radius: var(--radius-md);
  }

  #articles article {
    padding: var(--space-4);
  }

  #howto ol li {
    padding: var(--space-3) var(--space-3) var(--space-3) 56px;
  }

  #howto ol li::before {
    left: 10px;
    width: 30px;
    height: 30px;
    font-size: 0.82rem;
  }

  #faq h3 {
    padding: var(--space-3) var(--space-4) var(--space-3) 46px;
  }

  #faq h3::before {
    left: 12px;
    width: 24px;
    height: 24px;
  }

  #faq h3 + p {
    padding: var(--space-3) var(--space-4);
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  #sitemap a,
  #links a {
    padding: 9px 10px;
    font-size: 0.85rem;
  }

  footer[role="contentinfo"] {
    padding: var(--space-6) var(--space-4) var(--space-5);
  }

  footer[role="contentinfo"] p {
    font-size: 0.8rem;
  }
}

@media (max-width: 380px) {
  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  #sitemap,
  #links {
    display: none;
  }

  body {
    background: #FFFFFF;
    color: #000000;
  }

  main > section {
    box-shadow: none;
    border: 1px solid #CCCCCC;
    break-inside: avoid;
  }
}