:root {
  --color-primary: #FF6B00;
  --color-primary-hover: #E65100;
  --color-secondary: #0B1B3D;
  --color-secondary-deep: #070F24;
  --color-accent: #B6FF00;
  --color-bg: #F4F6FA;
  --color-card: #FFFFFF;
  --color-card-tint: #E0E8FF;
  --color-text: #2D3748;
  --color-text-light: #5A6A85;
  --color-white: #FFFFFF;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(11, 27, 61, .08);
  --shadow-lg: 0 12px 32px rgba(11, 27, 61, .16);
  --font-display: "Noto Sans SC", "Source Sans Pro", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-max: 1240px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4 {
  margin: 0 0 .5em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-secondary);
}

h1 { font-size: clamp(2.25rem, 5vw, 3rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); }
h3 { font-size: 1.375rem; }

p { margin: 0 0 1em; }

ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button, input, textarea, select {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: .75rem 1.25rem;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-secondary);
  font-weight: 700;
  font-size: .9375rem;
  box-shadow: var(--shadow-lg);
}

.skip-link:focus-visible {
  top: 1rem;
}

.container {
  width: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 2rem, var(--container-max));
  }
}

.page-main {
  padding-block: 3rem 5rem;
}

.page-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  letter-spacing: -.02em;
  margin-bottom: 1rem;
}

.page-intro {
  max-width: 62ch;
  font-size: 1.125rem;
  color: var(--color-text-light);
}

.section {
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section-dark {
  background: var(--color-secondary);
  color: var(--color-white);
}

.section-dark :is(h1, h2, h3) {
  color: var(--color-white);
}

.section-dark .page-intro {
  color: rgba(255, 255, 255, .75);
}

.section-tint {
  background: var(--color-card-tint);
}

.rule-gradient {
  height: 3px;
  border: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin-block: 3rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .375rem;
  font-size: .875rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

.breadcrumbs li + li::before {
  content: "›";
  margin-right: .375rem;
  color: var(--color-text-light);
  opacity: .6;
}

.breadcrumbs a {
  color: var(--color-primary);
  font-weight: 600;
}

.breadcrumbs a:hover {
  color: var(--color-primary-hover);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-secondary);
  color: var(--color-white);
  box-shadow: 0 4px 20px rgba(0, 0, 0, .15);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary) 0 65%, var(--color-accent) 65%);
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 2;
  pointer-events: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 76px;
  padding-block: .75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: .02em;
  color: var(--color-white);
  line-height: 1;
}

.brand-mark {
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  display: grid;
  place-items: center;
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: 0 2px 10px rgba(255, 107, 0, .35);
}

.brand-mark svg {
  width: 28px;
  height: 28px;
}

.site-nav {
  padding-left: 1.5rem;
  border-left: 1px solid rgba(255, 255, 255, .12);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: .25rem;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: .55rem 1rem;
  border-radius: var(--radius-pill);
  color: rgba(255, 255, 255, .85);
  font-weight: 600;
  font-size: .9375rem;
  line-height: 1.3;
  transition: background .2s, color .2s, box-shadow .2s;
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, .1);
}

.nav-link[aria-current="page"] {
  color: var(--color-secondary);
  background: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(182, 255, 0, .25);
}

.nav-cta {
  margin-left: .75rem;
}

.nav-cta .btn {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  position: relative;
  border: 0;
  background: transparent;
  color: var(--color-white);
  cursor: pointer;
  padding: .5rem .25rem .5rem .75rem;
  border-radius: var(--radius-md);
  align-items: center;
  gap: .5rem;
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 26px;
}

.nav-toggle-line {
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s, opacity .2s;
}

.nav-toggle-text {
  font-size: .75rem;
  font-weight: 700;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .7rem 1.35rem;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  font-family: var(--font-display);
  font-size: .9375rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-white);
  border-color: var(--color-primary-hover);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent);
}

.btn-accent:hover {
  background: var(--color-white);
  border-color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, .6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, .1);
  border-color: var(--color-white);
}

.btn-ghost-dark {
  background: transparent;
  color: var(--color-secondary);
  border-color: rgba(11, 27, 61, .3);
}

.btn-ghost-dark:hover {
  border-color: var(--color-secondary);
}

.btn-cta {
  background: var(--color-primary);
  color: var(--color-secondary);
}

.btn-cta:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent);
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.site-footer {
  position: relative;
  background: var(--color-secondary);
  color: rgba(255, 255, 255, .85);
  border-radius: 28px 28px 0 0;
}

.footer-accent {
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0 55%, var(--color-accent) 55%);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2rem;
  padding-block: 3rem;
}

.footer-brand-col {
  grid-column: span 4;
}

.footer-nav-col {
  grid-column: span 2;
}

.footer-contact-col {
  grid-column: span 3;
}

.footer-legal-col {
  grid-column: span 3;
}

.footer-brand {
  margin-bottom: 1.25rem;
}

.footer-trust {
  max-width: 36ch;
  color: rgba(255, 255, 255, .75);
  font-size: .9375rem;
  line-height: 1.75;
}

.footer-heading {
  color: var(--color-accent);
  font-size: .8125rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  margin-bottom: .75rem;
}

.footer-list li {
  margin-bottom: .5rem;
}

.footer-list a {
  color: rgba(255, 255, 255, .85);
  font-size: .9375rem;
  transition: color .2s;
}

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

.footer-copy {
  margin-top: 1.5rem;
  font-size: .875rem;
  color: rgba(255, 255, 255, .6);
  line-height: 1.75;
}

.footer-icp {
  display: block;
}

.scroll-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 0;
  background: var(--color-primary);
  color: var(--color-secondary);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .2s, transform .2s, background .2s;
  z-index: 900;
}

.scroll-top[data-visible] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.scroll-top:hover {
  background: var(--color-accent);
  color: var(--color-secondary);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.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));
}

.card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(11, 27, 61, .04);
}

.card-hover {
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(255, 107, 0, .15);
}

.card-accent {
  border-top: 4px solid var(--color-primary);
}

.card-green {
  border-top: 4px solid var(--color-accent);
}

.card-tint {
  background: var(--color-card-tint);
}

.card-light {
  background: var(--color-white);
}

.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  padding-block: clamp(3rem, 7vw, 5rem);
}

.hero-content {
  max-width: 34rem;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .35rem 1rem;
  border-radius: var(--radius-pill);
  background: rgba(182, 255, 0, .15);
  color: var(--color-accent);
  font-size: .8125rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.05;
}

.hero-text {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin-top: 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.hero-visual {
  position: relative;
  min-height: 380px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 78% 22%, rgba(255, 107, 0, .5), transparent 32%),
    linear-gradient(135deg, var(--color-secondary), #1B2F52);
  overflow: hidden;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-lg);
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -15% -10% -25% 25%;
  background: linear-gradient(115deg, transparent 40%, rgba(182, 255, 0, .22) 41%, transparent 44%);
  transform: skewX(-10deg);
}

@media (max-width: 1024px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-secondary);
    border-left: 0;
    padding: 1rem 1.25rem 1.25rem;
    box-shadow: 0 20px 30px rgba(0, 0, 0, .2);
    border-bottom: 1px solid rgba(255, 255, 255, .1);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
  }

  .nav-link {
    display: block;
    padding: .85rem 1rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
  }

  .nav-cta {
    margin-left: 0;
    margin-top: .75rem;
  }

  .nav-cta .btn {
    width: 100%;
  }

  .hero-split {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 280px;
  }

  .footer-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .footer-brand-col {
    grid-column: span 6;
  }

  .footer-nav-col {
    grid-column: span 2;
  }

  .footer-contact-col {
    grid-column: span 2;
  }

  .footer-legal-col {
    grid-column: span 2;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 2rem, var(--container-max));
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .header-inner {
    min-height: 64px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding-block: 2.5rem;
  }

  .footer-brand-col {
    grid-column: span 2;
  }

  .footer-nav-col {
    grid-column: span 1;
  }

  .footer-contact-col {
    grid-column: span 1;
  }

  .footer-legal-col {
    grid-column: span 2;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .scroll-top {
    right: 1rem;
    bottom: 1rem;
    width: 44px;
    height: 44px;
  }
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  padding: .25rem .875rem;
  border-radius: var(--radius-pill);
  background: var(--color-card-tint);
  color: var(--color-secondary);
  font-size: .75rem;
  font-weight: 700;
  line-height: 1.6;
}

.tag-live {
  background: var(--color-accent);
}

.tag-live::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

.tag-ready {
  background: var(--color-primary);
  color: var(--color-white);
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(11, 27, 61, .04);
}

.stat-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.75rem;
  color: var(--color-primary);
  line-height: 1.1;
}

.stat-label {
  font-size: .8125rem;
  color: var(--color-text-light);
  margin-top: .25rem;
}

.section-dark .stat-item {
  background: rgba(255, 255, 255, .08);
  border-color: transparent;
}

.section-dark .stat-value {
  color: var(--color-accent);
}

.section-dark .stat-label {
  color: rgba(255, 255, 255, .7);
}

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

.timeline-item {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1.5rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: .5rem;
  top: 1.25rem;
  bottom: -1.5rem;
  width: 2px;
  background: var(--color-card-tint);
}

.timeline-item:last-child::before {
  display: none;
}

.timeline-dot {
  position: absolute;
  left: 0;
  top: .375rem;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline-content {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

.path-steps {
  display: grid;
  gap: 1.5rem;
}

.step-node {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step-marker {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-secondary);
  font-weight: 900;
  display: grid;
  place-items: center;
  border: 4px solid var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.step-body {
  padding-top: .15rem;
}

.step-title {
  font-weight: 800;
  color: var(--color-secondary);
}

.step-text {
  font-size: .9375rem;
  color: var(--color-text-light);
  margin-top: .25rem;
}

.media-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-card-tint);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.media-frame-wide {
  aspect-ratio: 16 / 9;
}

.media-frame-sweep {
  background:
    linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, .12) 45%, transparent 60%),
    linear-gradient(135deg, var(--color-secondary), #1B2F52);
}

.media-frame-sweep::after {
  content: "运动 · 数据 · 实时";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, .7);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-align: center;
}

.list-check {
  list-style: none;
}

.list-check li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: .5rem;
}

.list-check li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .45em;
  width: .65rem;
  height: .35rem;
  border-left: 3px solid var(--color-accent);
  border-bottom: 3px solid var(--color-accent);
  transform: rotate(-45deg);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}