:root {
  --primary: #5b6ef5;
  --primary-light: #8f9bff;
  --primary-dark: #4353d8;
  --accent: #f56e8f;
  --accent-2: #3fb6a8;
  --bg: #f4f6fc;
  --bg-alt: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --text: #1c2130;
  --text-soft: #4a5268;
  --text-muted: #7a8299;
  --border: rgba(91, 110, 245, 0.14);
  --border-strong: rgba(91, 110, 245, 0.28);
  --shadow-sm: 0 2px 8px rgba(28, 33, 48, 0.06);
  --shadow-md: 0 8px 28px rgba(28, 33, 48, 0.10);
  --shadow-lg: 0 18px 48px rgba(28, 33, 48, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --header-h: 68px;
  --gradient-hero: linear-gradient(135deg, #5b6ef5 0%, #8f9bff 45%, #f56e8f 100%);
  --gradient-accent: linear-gradient(135deg, #5b6ef5, #3fb6a8);
  --glass-blur: saturate(180%) blur(18px);
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
  --maxw: 1200px;
}

html[data-theme="dark"] {
  --bg: #0d1017;
  --bg-alt: #141926;
  --surface: rgba(24, 30, 46, 0.68);
  --surface-solid: #181e2e;
  --text: #eef1f8;
  --text-soft: #c3c9da;
  --text-muted: #8b93a8;
  --border: rgba(143, 155, 255, 0.16);
  --border-strong: rgba(143, 155, 255, 0.34);
  --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);
  --gradient-hero: linear-gradient(135deg, #2c3a9e 0%, #4a56c9 45%, #a8405c 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: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(91, 110, 245, 0.10), transparent 42%),
    radial-gradient(circle at 88% 18%, rgba(245, 110, 143, 0.09), transparent 40%),
    radial-gradient(circle at 50% 92%, rgba(63, 182, 168, 0.08), transparent 46%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
}

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

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

html[data-theme="dark"] a {
  color: var(--primary-light);
}

html[data-theme="dark"] a:hover {
  color: #b3bcff;
}

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

h1 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.32rem); }
h4 { font-size: 1.05rem; }

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

ul, ol { margin: 0 0 1em; padding-left: 1.3em; }

li { color: var(--text-soft); }

address { font-style: normal; }

::selection {
  background: rgba(91, 110, 245, 0.28);
  color: var(--text);
}

#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}

.logo:hover { text-decoration: none; color: var(--primary); }

.logo svg {
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(91, 110, 245, 0.4);
  transition: transform var(--transition);
}

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

.logo-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  white-space: nowrap;
}

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

#main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

#main-nav a {
  display: inline-block;
  padding: 7px 12px;
  font-size: 0.9rem;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

#main-nav a:hover {
  background: rgba(91, 110, 245, 0.12);
  color: var(--primary);
  text-decoration: none;
  transform: translateY(-1px);
}

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

.header-tools form {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 3px 3px 3px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.header-tools form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(91, 110, 245, 0.18);
}

.header-tools input[type="search"] {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 0.86rem;
  padding: 6px 4px;
  width: 168px;
  font-family: inherit;
}

.header-tools input::placeholder { color: var(--text-muted); }

.header-tools button {
  font-family: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  border-radius: var(--radius-pill);
  padding: 7px 16px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.header-tools button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(91, 110, 245, 0.35);
}

#theme-toggle {
  background: var(--bg-alt);
  color: var(--text-soft);
  border: 1px solid var(--border);
  padding: 7px 14px;
}

#theme-toggle:hover {
  color: var(--primary);
  border-color: var(--border-strong);
  box-shadow: none;
}

#menu-toggle {
  display: none;
  background: var(--bg-alt);
  color: var(--text-soft);
  border: 1px solid var(--border);
  padding: 7px 14px;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.breadcrumb {
  padding: 16px 0 4px;
  font-size: 0.86rem;
}

.breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--text-muted);
}

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

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

.hero {
  margin: 18px 0 40px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  background: var(--gradient-hero);
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 78% 12%, rgba(255, 255, 255, 0.28), transparent 46%);
  pointer-events: none;
  z-index: 1;
}

.hero-slider {
  position: relative;
  width: 100%;
  height: clamp(200px, 34vw, 360px);
  overflow: hidden;
}

.hero-slider .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
}

.hero-slider .slide.active {
  opacity: 1;
  pointer-events: auto;
}

.hero-slider .slide svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slider-prev,
.slider-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.18);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
}

.slider-prev { left: 16px; }
.slider-next { right: 16px; }

.slider-prev:hover,
.slider-next:hover {
  background: rgba(255, 255, 255, 0.36);
  transform: translateY(-50%) scale(1.08);
}

.hero-text {
  position: relative;
  z-index: 2;
  margin-top: -60px;
  padding: 0 clamp(18px, 4vw, 56px) clamp(28px, 4vw, 48px);
  color: #fff;
}

.hero-text h1 {
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.28);
  margin: 0 0 0.5em;
  max-width: 900px;
}

.hero-text p {
  color: rgba(255, 255, 255, 0.92);
  max-width: 860px;
  font-size: clamp(0.92rem, 1.4vw, 1.02rem);
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.22);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.hero-stats .stat {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  text-align: center;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: transform var(--transition), background var(--transition);
}

.hero-stats .stat:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.26);
}

.hero-stats .num {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  line-height: 1.1;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-stats .label {
  display: block;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.86);
  margin-top: 4px;
}

.anchor-nav {
  margin: 0 0 36px;
  padding: 18px 20px;
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.anchor-nav h2 {
  font-size: 0.95rem;
  margin: 0 0 12px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.anchor-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.anchor-nav a {
  display: inline-block;
  font-size: 0.84rem;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  background: rgba(91, 110, 245, 0.09);
  color: var(--text-soft);
  text-decoration: none;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.anchor-nav a:hover {
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(91, 110, 245, 0.3);
}

main > section {
  margin: 0 0 40px;
  padding: clamp(20px, 3.2vw, 38px);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

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

main > section > h2 {
  position: relative;
  padding-bottom: 14px;
  margin: 0 0 22px;
}

main > section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: 4px;
  background: var(--gradient-accent);
}

main > section h3 {
  margin: 1.6em 0 0.6em;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  line-height: 1.4;
}

main > section h3:first-of-type { margin-top: 0.4em; }

main > section h4 {
  margin: 1.2em 0 0.4em;
  color: var(--primary);
}

html[data-theme="dark"] main > section h4 { color: var(--primary-light); }

#reviews blockquote {
  margin: 0 0 16px;
  padding: 18px 22px;
  background: var(--bg-alt);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

#reviews blockquote p {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 0.98rem;
}

#reviews blockquote footer {
  color: var(--text-muted);
  font-size: 0.86rem;
}

#news article,
#articles article {
  padding: 18px 20px;
  margin: 0 0 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

#news article h3,
#articles article h3 {
  margin: 0 0 6px;
  padding-left: 0;
  border-left: none;
  font-size: 1.08rem;
}

#news article time,
#articles article time {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding: 2px 10px;
  background: rgba(91, 110, 245, 0.1);
  border-radius: var(--radius-pill);
}

#articles article strong {
  color: var(--primary);
  font-weight: 600;
}

html[data-theme="dark"] #articles article strong { color: var(--primary-light); }

#articles article a {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--gradient-accent);
  color: #fff;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}

#articles article a:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(91, 110, 245, 0.35);
  text-decoration: none;
  color: #fff;
}

.faq-item {
  padding: 18px 20px;
  margin: 0 0 12px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.faq-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.faq-item h3 {
  margin: 0 0 8px;
  padding-left: 0;
  border-left: none;
  font-size: 1rem;
  color: var(--text);
  display: flex;
  gap: 8px;
  align-items: baseline;
}

.faq-item h3::before {
  content: "Q";
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 7px;
}

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

#howto h4 {
  position: relative;
  padding-left: 30px;
}

#howto h4::before {
  content: counter(howto-step);
  counter-increment: howto-step;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 22px;
  height: 22px;
  line-height: 22px;
  text-align: center;
  font-size: 0.76rem;
  font-weight: 800;
  color: #fff;
  background: var(--gradient-accent);
  border-radius: 50%;
}

#howto { counter-reset: howto-step; }

#contact address {
  padding: 20px 22px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: 0 0 18px;
}

#contact address p {
  margin: 0 0 6px;
  font-size: 0.94rem;
}

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

#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

#sitemap li a,
#links li a {
  display: block;
  padding: 8px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-soft);
  text-decoration: none;
  transition: all var(--transition);
}

#sitemap li a:hover,
#links li a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  text-decoration: none;
}

#site-footer {
  margin-top: 20px;
  padding: 48px 20px 28px;
  background: linear-gradient(180deg, rgba(91, 110, 245, 0.06), rgba(91, 110, 245, 0.02));
  border-top: 1px solid var(--border);
}

html[data-theme="dark"] #site-footer {
  background: linear-gradient(180deg, rgba(143, 155, 255, 0.06), rgba(0, 0, 0, 0.2));
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
}

.footer-col h2 {
  font-size: 0.98rem;
  margin: 0 0 14px;
  color: var(--text);
  position: relative;
  padding-bottom: 10px;
}

.footer-col h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 3px;
  border-radius: 3px;
  background: var(--gradient-accent);
}

.footer-col p {
  font-size: 0.88rem;
  margin: 0 0 8px;
  color: var(--text-muted);
}

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

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

.footer-col li a {
  font-size: 0.88rem;
  color: var(--text-soft);
  text-decoration: none;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-col li a:hover {
  color: var(--primary);
  padding-left: 4px;
  text-decoration: none;
}

.footer-copy {
  max-width: var(--maxw);
  margin: 36px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
}

#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  color: var(--primary);
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background var(--transition);
}

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

#back-to-top:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-3px);
}

.js-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: opacity, transform;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js-reveal { opacity: 1; transform: none; }
}

@media (max-width: 1024px) {
  .header-inner { gap: 12px; }
  #main-nav a { padding: 6px 9px; font-size: 0.86rem; }
  .header-tools input[type="search"] { width: 130px; }
}

@media (max-width: 860px) {
  :root { --header-h: 60px; }

  .header-inner {
    padding: 10px 16px;
    flex-wrap: wrap;
  }

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

  #main-nav {
    order: 10;
    flex-basis: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, opacity 0.3s ease;
    opacity: 0;
  }

  #main-nav.open {
    max-height: 560px;
    opacity: 1;
    padding-top: 8px;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  #main-nav a {
    display: block;
    padding: 10px 14px;
    font-size: 0.92rem;
    background: rgba(91, 110, 245, 0.06);
  }

  .header-tools form { flex: 1 1 auto; }
  .header-tools input[type="search"] { width: 100%; min-width: 90px; }

  .hero-text { margin-top: -40px; }
  .hero-slider { height: clamp(180px, 46vw, 280px); }

  .slider-prev,
  .slider-next { width: 38px; height: 38px; font-size: 1.2rem; }

  main { padding: 0 14px 30px; }

  main > section {
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }

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

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

  .logo-text { font-size: 1rem; }
  .logo svg { width: 34px; height: 34px; }

  .header-tools { gap: 6px; }
  .header-tools button { padding: 7px 11px; font-size: 0.8rem; }

  .hero-stats { gap: 10px; }
  .hero-stats .stat { padding: 12px 8px; }

  .anchor-nav { padding: 14px; }
  .anchor-nav a { font-size: 0.8rem; padding: 4px 10px; }

  #sitemap ul,
  #links ul { grid-template-columns: repeat(2, 1fr); }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    width: 44px;
    height: 44px;
  }

  .footer-inner { gap: 22px; }
}

@media print {
  #site-header,
  #back-to-top,
  .hero-slider,
  .anchor-nav,
  .header-tools { display: none !important; }
  body { background: #fff; color: #000; }
  main > section { box-shadow: none; border: 1px solid #ddd; }
  a { color: #000; text-decoration: underline; }
}