:root {
  --color-primary: #0A1F44;
  --color-primary-dark: #06132B;
  --color-primary-light: #1E3A66;
  --color-accent: #FF6B35;
  --color-accent-light: #FF9A6B;
  --color-bg: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  --font-heading: "Source Han Sans Heavy", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 10px rgba(6, 19, 43, 0.06);
  --shadow-md: 0 10px 28px rgba(6, 19, 43, 0.1);
  --shadow-lg: 0 18px 48px rgba(6, 19, 43, 0.16);
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-primary);
}

h1 { font-size: 48px; }
h2 { font-size: 36px; }
h3 { font-size: 24px; }
h4 { font-size: 20px; }

p {
  margin-bottom: 1em;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: color 0.25s ease;
}

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

ul, ol {
  list-style-position: inside;
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.container-narrow {
  width: 100%;
  max-width: 880px;
  margin-inline: auto;
  padding-inline: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn-accent {
  background-color: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.35);
}

.btn-accent:hover {
  background-color: var(--color-accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.42);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: var(--radius-pill);
  background-color: rgba(255, 107, 53, 0.1);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
}

.badge-dark {
  border-color: var(--color-primary-light);
  background-color: var(--color-primary);
  color: #fff;
}

.stat-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.2;
  box-shadow: var(--shadow-sm);
}

.stat-chip small {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.6);
}

.panel {
  padding: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.card {
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  background-color: var(--color-surface);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 107, 53, 0.28);
  box-shadow: var(--shadow-md);
}

.section {
  padding: 72px 0;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-bottom: 36px;
}

.section-index {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-title {
  margin: 0;
}

.section-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.section-more::after {
  content: "→";
  transition: transform 0.22s ease;
}

.section-more:hover {
  color: var(--color-accent);
}

.section-more:hover::after {
  transform: translateX(4px);
}

.grid {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 20px 0;
  list-style: none;
  font-size: 14px;
  color: var(--color-text-muted);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-border);
}

.breadcrumb-item a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-primary-light);
  border-radius: 14px;
  aspect-ratio: 16 / 9;
}

.image-frame > * {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(6, 19, 43, 0.16), transparent 36%);
  pointer-events: none;
}

.image-frame-21x9 { aspect-ratio: 21 / 9; }
.image-frame-4x3 { aspect-ratio: 4 / 3; }
.image-frame-1x1 { aspect-ratio: 1 / 1; }

.image-frame-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: rgba(255, 255, 255, 0.8);
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.image-frame-placeholder::after {
  display: none;
}

.timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 7px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding: 0 0 28px 36px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  background-color: var(--color-surface);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.12);
}

.timeline-meta {
  margin-bottom: 2px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.timeline-title {
  margin-bottom: 4px;
  font-weight: 700;
  color: var(--color-primary);
}

.timeline-desc {
  font-size: 14px;
  color: var(--color-text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.text-muted {
  color: var(--color-text-muted);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 14px 0;
  background: rgba(245, 247, 250, 0.88);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
  backdrop-filter: saturate(150%) blur(16px);
}

.header-inner {
  position: relative;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 10px 20px;
  border-radius: 0 0 12px 12px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.nav-pill {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 8px 20px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

@media (min-width: 992px) {
  .nav-pill::after {
    content: "";
    position: absolute;
    top: -50%;
    right: -8%;
    width: 46%;
    height: 200%;
    background: linear-gradient(115deg, transparent 0%, transparent 70%, rgba(255, 107, 53, 0.09) 70%, rgba(255, 107, 53, 0.09) 82%, rgba(255, 255, 255, 0.04) 82%, rgba(255, 255, 255, 0.04) 90%, transparent 90%);
    transform: rotate(6deg);
    pointer-events: none;
  }
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
  color: var(--color-primary-dark);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.4);
  transform: skewX(-8deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: 0.04em;
  color: #fff;
}

.brand-sub {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-item {
  margin: 0;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.74);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.22s ease, background-color 0.22s ease, box-shadow 0.22s ease;
}

.nav-link:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav-link[aria-current="page"] {
  color: #fff;
  background-color: rgba(255, 107, 53, 0.16);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 53, 0.5);
}

.nav-item-login-mobile {
  display: none;
}

.nav-login {
  flex-shrink: 0;
  margin-left: 4px;
}

.login-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.22);
  animation: login-dot-pulse 2.2s ease-in-out infinite;
}

@keyframes login-dot-pulse {
  0%, 100% {
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.18);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.05);
  }
}

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 0;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle-bar {
  position: absolute;
  left: 12px;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background-color: #fff;
  transition: transform 0.28s ease, opacity 0.28s ease, background-color 0.28s ease;
}

.nav-toggle-bar:nth-child(1) {
  top: 14px;
}

.nav-toggle-bar:nth-child(2) {
  top: 21px;
}

.nav-toggle-bar:nth-child(3) {
  top: 28px;
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 991.98px) {
  .nav-pill {
    flex-wrap: wrap;
    gap: 10px;
    padding: 8px;
    border-radius: 26px;
  }

  .brand {
    margin-right: auto;
  }

  .site-nav {
    display: none;
    flex-basis: 100%;
    order: 10;
    margin-left: 0;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 18px;
    background-color: rgba(255, 255, 255, 0.04);
  }

  .site-nav[data-open] {
    display: block;
    animation: nav-drop-in 0.3s ease both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    display: block;
    padding: 11px 14px;
    text-align: left;
  }

  .nav-item-login-mobile {
    display: block;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-link-login {
    color: var(--color-accent);
    font-weight: 700;
    background-color: rgba(255, 107, 53, 0.08);
    border: 1px solid rgba(255, 107, 53, 0.3);
  }

  .nav-login {
    display: none;
  }

  .nav-toggle {
    display: block;
  }
}

@keyframes nav-drop-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-footer {
  position: relative;
  margin-top: 80px;
  overflow: hidden;
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.68);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 26%, var(--color-primary-light) 26%, var(--color-primary-light) 44%, transparent 44%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr;
  gap: 48px;
  padding: 64px 0 48px;
}

.footer-brand-col {
  max-width: 420px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  text-decoration: none;
}

.footer-brand:hover {
  text-decoration: none;
}

.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  color: var(--color-primary-dark);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 14px;
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
  transform: skewX(-8deg);
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: #fff;
}

.footer-brand-sub {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.48);
}

.footer-tagline {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent-light);
}

.footer-trust {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.56);
}

.footer-col {
  min-width: 0;
}

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

.footer-col-contact {
  min-width: 0;
}

.footer-heading {
  display: inline-block;
  margin: 6px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(255, 107, 53, 0.35);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 16px;
  color: #fff;
}

.footer-nav-list a {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.64);
  text-decoration: none;
  transition: color 0.22s ease, transform 0.22s ease;
}

.footer-nav-list a:hover {
  color: var(--color-accent-light);
  transform: translateX(4px);
}

.footer-contact-list {
  font-size: 14px;
  line-height: 1.7;
}

.footer-contact-item {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

.footer-contact-label {
  flex-shrink: 0;
  color: rgba(255, 255, 255, 0.4);
}

.footer-contact-item a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.22s ease;
}

.footer-contact-item a:hover {
  color: var(--color-accent-light);
}

.footer-contact-address {
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
}

.footer-copyright {
  margin: 0;
}

.footer-icp {
  margin: 0;
}

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.42);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}

.back-top:hover {
  background-color: var(--color-accent-light);
  transform: translateY(0) scale(1.05);
}

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

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 991.98px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
    padding: 56px 0 40px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
    max-width: 520px;
  }
}

@media (max-width: 575.98px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 0 32px;
  }

  .footer-brand-col {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

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

@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;
    scroll-behavior: auto !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}