:root {
  --bg: #f4f5fa;
  --bg-elev: #ffffff;
  --bg-soft: #eceef6;
  --text: #1a1a2e;
  --text-soft: #5a5f75;
  --text-mute: #8a8fa3;
  --primary: #e94560;
  --primary-dark: #c72e48;
  --accent: #5b4bdb;
  --accent-2: #2ec4b6;
  --border: #e2e5ef;
  --glass: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.7);
  --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-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --grad-hero: linear-gradient(135deg, #1a1a2e 0%, #2d2b55 45%, #5b4bdb 100%);
  --grad-accent: linear-gradient(135deg, #e94560 0%, #ff7a59 100%);
  --grad-cool: linear-gradient(135deg, #5b4bdb 0%, #2ec4b6 100%);
  --grad-text: linear-gradient(120deg, #e94560, #5b4bdb 60%, #2ec4b6);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 64px;
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --bg-elev: #181826;
  --bg-soft: #1f1f30;
  --text: #eef0f8;
  --text-soft: #b3b8cc;
  --text-mute: #7e8399;
  --border: #2a2a3e;
  --glass: rgba(30, 30, 48, 0.55);
  --glass-border: rgba(255, 255, 255, 0.08);
  --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, #0b0b16 0%, #1d1b3a 45%, #3a2f8f 100%);
}

*,
*::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: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  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 40%
    ),
    radial-gradient(circle at 88% 22%, rgba(91, 75, 219, 0.1), transparent 42%);
  background-attachment: fixed;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

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

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

h1 {
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  margin: 0 0 0.6em;
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  margin: 0 0 0.7em;
  position: relative;
  padding-left: 0.9em;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  bottom: 0.22em;
  width: 5px;
  border-radius: 4px;
  background: var(--grad-accent);
}

h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  margin: 1.6em 0 0.5em;
}

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

ul,
ol {
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

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

::selection {
  background: rgba(233, 69, 96, 0.25);
}

:focus-visible {
  outline: 3px solid rgba(91, 75, 219, 0.55);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ Header ============ */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
}

.top-bar {
  background: var(--grad-hero);
  color: #fff;
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  padding: 0.35rem 1rem;
}

.top-bar p {
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
}

.header-main {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0.65rem 1.25rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}

.brand svg {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease);
}

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

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-text strong {
  font-size: 1.15rem;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--text-mute);
  letter-spacing: 0.02em;
}

#main-nav {
  flex: 1 1 auto;
}

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

#main-nav a {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  font-size: 0.88rem;
  color: var(--text-soft);
  border-radius: 999px;
  position: relative;
  transition: color 0.25s var(--ease), background 0.25s var(--ease),
    transform 0.25s var(--ease);
}

#main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.18rem;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: translateX(-50%);
  transition: width 0.3s var(--ease);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--text);
  background: var(--bg-soft);
  transform: translateY(-1px);
}

#main-nav a:hover::after {
  width: 55%;
}

.header-main form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 0 1 300px;
}

.header-main form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

#site-search {
  flex: 1;
  min-width: 0;
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

#site-search::placeholder {
  color: var(--text-mute);
}

#site-search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 75, 219, 0.18);
}

.header-main form[role="search"] button,
#theme-toggle {
  padding: 0.5rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-accent);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
    filter 0.25s var(--ease);
}

#theme-toggle {
  background: var(--grad-cool);
}

.header-main form[role="search"] button:hover,
#theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  filter: brightness(1.06);
}

.header-main form[role="search"] button:active,
#theme-toggle:active {
  transform: translateY(0);
}

#menu-toggle {
  display: none;
  padding: 0.5rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.25s var(--ease);
}

#menu-toggle:hover {
  background: var(--border);
}

#site-header nav[aria-label="面包屑导航"] {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem 0.6rem;
}

#site-header nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.78rem;
  color: var(--text-mute);
}

#site-header nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin-right: 0.4rem;
  color: var(--text-mute);
}

/* ============ Main / Sections ============ */
main {
  display: block;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

main > section {
  margin-bottom: 1.75rem;
  padding: clamp(1.25rem, 3vw, 2.25rem);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.4s var(--ease), transform 0.4s var(--ease),
    background 0.4s var(--ease), border-color 0.4s var(--ease);
}

main > section:hover {
  box-shadow: var(--shadow-md);
}

main > section:target {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(91, 75, 219, 0.16), var(--shadow-md);
}

/* ============ Hero ============ */
#hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-hero);
  border: none;
  color: #fff;
  padding: clamp(1.75rem, 4vw, 3.25rem);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

#hero::before,
#hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
  opacity: 0.55;
}

#hero::before {
  width: 380px;
  height: 380px;
  top: -140px;
  right: -100px;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.7), transparent 70%);
  animation: float-slow 14s ease-in-out infinite alternate;
}

#hero::after {
  width: 320px;
  height: 320px;
  bottom: -150px;
  left: -80px;
  background: radial-gradient(circle, rgba(46, 196, 182, 0.6), transparent 70%);
  animation: float-slow 18s ease-in-out infinite alternate-reverse;
}

@keyframes float-slow {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-30px, 30px, 0) scale(1.12);
  }
}

#hero h1,
#hero h2 {
  color: #fff;
  position: relative;
  z-index: 1;
}

#hero h2 {
  padding-left: 0.9em;
}

#hero h2::before {
  background: linear-gradient(180deg, #fff, rgba(255, 255, 255, 0.4));
}

#hero p {
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  z-index: 1;
  max-width: 72ch;
}

#hero > nav {
  position: relative;
  z-index: 1;
  margin-top: 1.5rem;
}

#hero > nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

#hero > nav a {
  display: inline-block;
  padding: 0.55rem 1.15rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), background 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

#hero > nav a:hover,
#hero > nav a:focus-visible {
  background: rgba(255, 255, 255, 0.24);
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
}

.banner-carousel {
  display: grid;
  gap: 1.25rem;
}

.banner-slide {
  padding: 1.25rem 1.35rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform 0.4s var(--ease), background 0.4s var(--ease),
    border-color 0.4s var(--ease);
  animation: rise-in 0.7s var(--ease) both;
}

.banner-slide:nth-child(2) {
  animation-delay: 0.12s;
}

.banner-slide:nth-child(3) {
  animation-delay: 0.24s;
}

.banner-slide:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.13);
  border-color: rgba(255, 255, 255, 0.3);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Stats ============ */
#stats ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

#stats li {
  margin: 0;
  padding: 1.35rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
    background 0.35s var(--ease);
}

#stats li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  background: var(--bg-elev);
}

#stats strong {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.2;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 0.25rem;
}

/* ============ Products list ============ */
#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.9rem;
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 0;
}

#products ul li {
  margin: 0;
  padding: 1rem 1.1rem 1rem 2.7rem;
  position: relative;
  font-size: 0.92rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

#products ul li::before {
  content: "✓";
  position: absolute;
  left: 1rem;
  top: 0.95rem;
  width: 1.25rem;
  height: 1.25rem;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-cool);
  border-radius: 50%;
}

#products ul li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

/* ============ Cases ============ */
#cases blockquote {
  margin: 1rem 0;
  padding: 1.1rem 1.25rem 1.1rem 1.5rem;
  position: relative;
  background: var(--bg-soft);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

#cases blockquote::before {
  content: "“";
  position: absolute;
  top: -0.35rem;
  left: 0.4rem;
  font-size: 2.4rem;
  line-height: 1;
  color: var(--primary);
  opacity: 0.35;
  font-family: Georgia, serif;
}

#cases blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

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

/* ============ News ============ */
#news > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

#news > ul > li {
  margin: 0;
  padding: 1.25rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
    border-color 0.35s var(--ease);
}

#news > ul > li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#news h3 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
}

#news h3 a {
  color: var(--text);
}

#news h3 a:hover {
  color: var(--primary);
}

#news p {
  font-size: 0.86rem;
  margin-bottom: 0.5rem;
}

#news p:first-of-type {
  color: var(--text-mute);
  font-size: 0.78rem;
}

/* ============ Articles ============ */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

#articles > h2,
#articles > p {
  grid-column: 1 / -1;
}

#articles article {
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease),
    border-color 0.4s var(--ease);
}

#articles article::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--grad-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}

#articles article:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

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

#articles h3 {
  margin: 0 0 0.45rem;
  font-size: 1.02rem;
}

#articles p {
  font-size: 0.86rem;
  margin-bottom: 0.6rem;
}

#articles p:first-of-type {
  color: var(--text-mute);
  font-size: 0.76rem;
}

#articles article > a {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.84rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
    border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

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

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 0.7rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

#faq details:hover {
  border-color: var(--accent);
}

#faq details[open] {
  box-shadow: var(--shadow-sm);
  border-color: var(--accent);
}

#faq summary {
  padding: 0.95rem 2.6rem 0.95rem 1.15rem;
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--text);
  cursor: pointer;
  position: relative;
  list-style: none;
  transition: background 0.3s var(--ease);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--primary);
  transition: transform 0.3s var(--ease);
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

#faq summary:hover {
  background: var(--bg-elev);
}

#faq details p {
  margin: 0;
  padding: 0 1.15rem 1.1rem;
  font-size: 0.9rem;
  animation: fade-in 0.35s var(--ease);
}

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

/* ============ HowTo ============ */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  margin: 0 0 0.7rem;
  padding: 0.85rem 1rem 0.85rem 3.1rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.6rem;
  height: 1.6rem;
  display: grid;
  place-items: center;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-accent);
  border-radius: 50%;
}

#howto ol li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

#howto ul li {
  padding-left: 0.2rem;
}

/* ============ Knowledge ============ */
#knowledge h3 {
  padding-left: 0.75rem;
  border-left: 3px solid var(--accent-2);
}

/* ============ Contact ============ */
#contact address {
  font-style: normal;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.7rem;
  margin: 1rem 0;
}

#contact address p {
  margin: 0;
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

#contact address p:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

/* ============ Sitemap / Links ============ */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 0.42rem 0.95rem;
  font-size: 0.84rem;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
    transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-cool);
  border-color: transparent;
  transform: translateY(-2px);
}

/* ============ Footer ============ */
#site-footer {
  background: var(--grad-hero);
  color: rgba(255, 255, 255, 0.85);
  padding: 2.5rem 1.25rem 1.75rem;
  margin-top: 1rem;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.35), transparent 70%);
  filter: blur(50px);
  pointer-events: none;
}

.footer-brand,
#site-footer nav,
#site-footer > p {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}

.footer-brand strong {
  display: block;
  font-size: 1.3rem;
  color: #fff;
  letter-spacing: 0.02em;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  margin: 0.2rem 0 1.25rem;
}

#site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

#site-footer nav a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.86rem;
  position: relative;
  transition: color 0.25s var(--ease);
}

#site-footer nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: #fff;
  transition: width 0.3s var(--ease);
}

#site-footer nav a:hover {
  color: #fff;
}

#site-footer nav a:hover::after {
  width: 100%;
}

#site-footer > p {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding-top: 1.1rem;
  margin-bottom: 0;
}

/* ============ Back to top ============ */
#back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  width: 3rem;
  height: 3rem;
  padding: 0;
  font-size: 0;
  color: transparent;
  background: var(--grad-accent);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.9);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease),
    visibility 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

#back-to-top::before {
  content: "↑";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}

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

#back-to-top:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px) scale(1.05);
}

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

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

@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .header-main {
    gap: 0.85rem;
  }
  #main-nav a {
    padding: 0.35rem 0.55rem;
    font-size: 0.82rem;
  }
  .header-main form[role="search"] {
    flex: 1 1 220px;
  }
}

@media (max-width: 860px) {
  .header-main {
    padding: 0.6rem 1rem;
  }
  #menu-toggle {
    display: inline-block;
    order: 4;
  }
  #main-nav {
    order: 5;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--ease);
  }
  #main-nav.is-open {
    max-height: 480px;
  }
  #main-nav ul {
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.4rem 0;
  }
  #main-nav a {
    display: block;
    padding: 0.55rem 0.75rem;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
  }
  #main-nav a::after {
    display: none;
  }
  .header-main form[role="search"] {
    order: 3;
    flex: 1 1 100%;
  }
  #theme-toggle {
    order: 2;
  }
  .brand {
    order: 1;
    flex: 1 1 auto;
  }
  #site-header nav[aria-label="面包屑导航"] {
    padding: 0 1rem 0.55rem;
  }
  main {
    padding: 1rem 1rem 2.5rem;
  }
  main > section {
    margin-bottom: 1.25rem;
    border-radius: var(--radius-md);
  }
  #hero {
    border-radius: var(--radius-lg);
  }
  #articles {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }
  .top-bar {
    font-size: 0.72rem;
  }
  .brand-text span {
    display: none;
  }
  .brand-text strong {
    font-size: 1.05rem;
  }
  #stats ul {
    grid-template-columns: repeat(2, 1fr);
  }
  #stats li {
    padding: 1rem 0.6rem;
  }
  .banner-slide {
    padding: 1rem;
  }
  #hero > nav ul {
    gap: 0.45rem;
  }
  #hero > nav a {
    padding: 0.45rem 0.9rem;
    font-size: 0.82rem;
  }
  #contact address {
    grid-template-columns: 1fr;
  }
  #back-to-top {
    right: 0.9rem;
    bottom: 0.9rem;
    width: 2.7rem;
    height: 2.7rem;
  }
}

@media (min-width: 1200px) {
  .banner-carousel {
    grid-template-columns: 1.6fr 1fr 1fr;
    align-items: stretch;
  }
}