:root {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --bg-elevated: #ffffff;
  --text: #1a1a2e;
  --text-soft: #4a4f6a;
  --text-muted: #7a809a;
  --primary: #1a1a2e;
  --accent: #f2a900;
  --accent-soft: #ffd166;
  --accent-2: #6c5ce7;
  --accent-3: #00b894;
  --border: #e0e5f2;
  --border-soft: #edf0f7;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 26, 46, 0.08);
  --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.12);
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --max-width: 1180px;
  --header-h: 68px;
  --transition: 0.28s cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0f1a;
    --bg-soft: #161827;
    --bg-elevated: #1c1f33;
    --text: #eef1fb;
    --text-soft: #c2c7dd;
    --text-muted: #8b91ab;
    --primary: #eef1fb;
    --accent: #f2a900;
    --accent-soft: #ffd166;
    --accent-2: #8f7ff5;
    --accent-3: #2ee6b6;
    --border: #2a2e47;
    --border-soft: #23263c;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.55);
    --glass-bg: rgba(22, 24, 39, 0.68);
    --glass-border: rgba(255, 255, 255, 0.08);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

@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;
  }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(
      circle at 12% 0%,
      rgba(242, 169, 0, 0.1),
      transparent 42%
    ),
    radial-gradient(circle at 88% 8%, rgba(108, 92, 231, 0.1), transparent 40%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--accent-2);
  text-decoration: none;
  transition: color var(--transition);
}

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

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
}

h2 {
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  position: relative;
  padding-bottom: 0.5em;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

h3 {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  margin-top: 1.6em;
}

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

ul,
ol {
  padding-left: 1.4em;
  margin: 0 0 1em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.4em;
}

::selection {
  background: var(--accent);
  color: #1a1a2e;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), background var(--transition);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand:hover,
.brand:focus-visible {
  color: var(--text);
  transform: translateY(-1px);
}

.brand-logo {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

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

.brand-name {
  background: linear-gradient(90deg, var(--text), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.main-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: inline-block;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  color: var(--text-soft);
  font-size: 0.92rem;
  font-weight: 600;
  position: relative;
  transition: color var(--transition), background var(--transition),
    transform var(--transition);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--text);
  background: rgba(242, 169, 0, 0.12);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  margin-left: auto;
  padding: 8px 16px;
  font: inherit;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), transform var(--transition),
    box-shadow var(--transition);
}

.menu-toggle:hover {
  background: var(--accent);
  color: #1a1a2e;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.section {
  margin: 48px 0;
  padding: clamp(22px, 4vw, 40px);
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  animation: fadeUp 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  transition: box-shadow var(--transition), transform var(--transition),
    border-color var(--transition);
}

.section:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: clamp(20px, 4vw, 48px);
  align-items: center;
  margin: 32px 0 40px;
  padding: clamp(24px, 5vw, 56px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  color: #f7f8ff;
  background: linear-gradient(
    135deg,
    #1a1a2e 0%,
    #2b2350 38%,
    #4a2f7a 68%,
    #6c5ce7 100%
  );
  background-size: 200% 200%;
  animation: gradientShift 14s ease infinite, fadeUp 0.7s ease both;
  box-shadow: var(--shadow-lg);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      circle at 82% 18%,
      rgba(242, 169, 0, 0.4),
      transparent 46%
    ),
    radial-gradient(circle at 8% 92%, rgba(0, 184, 148, 0.32), transparent 44%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  filter: blur(6px);
  pointer-events: none;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.hero-content,
.hero-visual {
  position: relative;
  z-index: 1;
}

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

.hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 5px;
  margin-top: 0.4em;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
}

.hero-lead {
  color: rgba(247, 248, 255, 0.86);
  font-size: clamp(0.96rem, 1.2vw, 1.05rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.96rem;
  letter-spacing: 0.01em;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), color var(--transition);
}

.btn-primary {
  color: #1a1a2e;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent));
  box-shadow: 0 8px 22px rgba(242, 169, 0, 0.4);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #1a1a2e;
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 30px rgba(242, 169, 0, 0.55);
}

.btn-secondary {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.4);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  color: #1a1a2e;
  background: #ffffff;
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-md);
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-visual svg {
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-md);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.35);
  transition: transform var(--transition), box-shadow var(--transition);
  animation: floatY 6s ease-in-out infinite;
}

.hero-visual svg:hover {
  transform: translateY(-6px) rotate(-1deg);
  box-shadow: 0 32px 70px rgba(0, 0, 0, 0.45);
}

@keyframes floatY {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  margin: 0 0 8px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 18px;
  font-size: 0.88rem;
  color: var(--text-muted);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  width: fit-content;
}

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb a {
  color: var(--text-soft);
  font-weight: 600;
}

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

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

/* ---------- News ---------- */
.news-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.news-list li {
  margin: 0;
  padding: 20px 22px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.news-list li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

.news-list li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.news-list li:hover::before {
  transform: scaleY(1);
}

.news-list h3 {
  margin: 0 0 0.4em;
  font-size: 1.05rem;
}

.news-list p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* ---------- Articles ---------- */
.article-card {
  margin: 22px 0;
  padding: 24px 26px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.article-card h3 {
  margin-top: 0;
  color: var(--text);
}

.article-card .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.8em;
}

.article-card a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--accent-2);
  font-size: 0.92rem;
}

.article-card a::after {
  content: "→";
  transition: transform var(--transition);
}

.article-card a:hover {
  color: var(--accent);
}

.article-card a:hover::after {
  transform: translateX(4px);
}

/* ---------- Blockquote ---------- */
blockquote {
  margin: 16px 0;
  padding: 18px 22px;
  background: linear-gradient(
    135deg,
    rgba(242, 169, 0, 0.1),
    rgba(108, 92, 231, 0.08)
  );
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

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

/* ---------- FAQ ---------- */
details {
  margin: 12px 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

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

summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 52px 18px 22px;
  font-weight: 700;
  color: var(--text);
  position: relative;
  transition: background var(--transition), color var(--transition);
  -webkit-user-select: none;
  user-select: none;
}

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

summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: #1a1a2e;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent));
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

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

summary:hover {
  background: rgba(242, 169, 0, 0.08);
  color: var(--accent-2);
}

details p {
  padding: 0 22px 20px;
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-soft);
  animation: fadeUp 0.4s ease both;
}

/* ---------- Contact / Sitemap / Links ---------- */
.contact-list,
.sitemap-list,
.friend-links {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  gap: 10px;
}

.contact-list {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sitemap-list {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.friend-links {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.contact-list li,
.sitemap-list li,
.friend-links li {
  margin: 0;
  padding: 14px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  color: var(--text-soft);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
}

.contact-list li:hover,
.sitemap-list li:hover,
.friend-links li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.contact-list li:nth-child(odd) {
  background: linear-gradient(
    135deg,
    var(--bg-elevated),
    rgba(242, 169, 0, 0.06)
  );
}

.sitemap-list a,
.friend-links a {
  display: block;
  color: var(--text);
  font-weight: 600;
  transition: color var(--transition);
}

.sitemap-list a:hover,
.friend-links a:hover {
  color: var(--accent-2);
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 40px;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border-top: 1px solid var(--border-soft);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.footer-inner section {
  padding: 22px 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.footer-inner section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.footer-inner h2 {
  font-size: 1rem;
  margin: 0 0 0.6em;
  padding-bottom: 0.5em;
}

.footer-inner h2::after {
  width: 36px;
  height: 3px;
}

.footer-inner p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-meta {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ---------- Scroll reveal (progressive enhancement) ---------- */
@supports (animation-timeline: view()) {
  .section {
    animation: revealOnScroll linear both;
    animation-timeline: view();
    animation-range: entry 0% entry 28%;
  }
  .hero {
    animation: gradientShift 14s ease infinite;
  }
}

@keyframes revealOnScroll {
  from {
    opacity: 0;
    transform: translateY(36px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .hero-visual {
    order: -1;
  }
  .hero-visual svg {
    max-width: 360px;
  }
}

@media (max-width: 820px) {
  .menu-toggle {
    display: inline-flex;
  }
  .main-nav {
    flex-basis: 100%;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition), opacity var(--transition),
      margin var(--transition);
  }
  .site-header.nav-open .main-nav {
    max-height: 520px;
    opacity: 1;
    margin-top: 8px;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 12px;
  }
  .main-nav a {
    display: block;
    padding: 11px 16px;
    border-radius: var(--radius-sm);
  }
  .main-nav a::after {
    display: none;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }
  .header-inner {
    padding: 0 14px;
    gap: 12px;
  }
  main {
    padding: 0 14px 28px;
  }
  .section {
    margin: 30px 0;
    border-radius: var(--radius-md);
  }
  .hero {
    margin: 20px 0 28px;
    padding: 26px 20px;
    border-radius: var(--radius-md);
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
  .breadcrumb ol {
    width: 100%;
    border-radius: var(--radius-md);
  }
  .news-list,
  .contact-list,
  .sitemap-list,
  .friend-links {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    padding: 32px 14px 24px;
    gap: 16px;
  }
  h2::after {
    width: 44px;
  }
}

/* ---------- Print ---------- */
@media print {
  .site-header,
  .menu-toggle,
  .hero-visual,
  .hero-actions,
  .site-footer {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .section,
  .article-card,
  details {
    box-shadow: none;
    border: 1px solid #ccc;
    animation: none;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}