:root {
  --c-primary: #0A1E3F;
  --c-primary-light: #1E3A5F;
  --c-accent: #FF6B00;
  --c-accent-soft: #FF8E53;
  --c-success: #00E676;
  --c-text: #E0E6ED;
  --c-text-bright: #FFFFFF;
  --c-text-dim: rgba(224, 230, 237, 0.72);
  --c-footer-bg: #0D1B2A;
  --c-border: rgba(255, 255, 255, 0.08);
  --c-border-strong: rgba(255, 255, 255, 0.16);
  --gradient-accent: linear-gradient(135deg, #FF6B00, #FF8E53);
  --font-heading: "PingFang SC", "Helvetica Neue", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-number: "Roboto Mono", "SF Mono", "Menlo", Consolas, monospace;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;
  --sidebar-w: 280px;
  --header-h-mobile: 64px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-primary);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
}

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

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

a {
  color: inherit;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

::selection {
  background: rgba(255, 107, 0, 0.35);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -200%);
  background: var(--c-accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: 0 0 12px 12px;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  z-index: 9999;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus-visible {
  transform: translate(-50%, 0);
}

#main-content {
  margin-left: var(--sidebar-w);
  min-height: 70vh;
  outline: none;
  scroll-margin-top: calc(var(--header-h-mobile) + 8px);
  background:
    radial-gradient(ellipse at 80% 10%, rgba(30, 58, 95, 0.35), transparent 55%),
    var(--c-primary);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 0 20px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 20% 85%, rgba(255, 107, 0, 0.07), transparent 55%),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 12px,
      rgba(255, 255, 255, 0.015) 12px,
      rgba(255, 255, 255, 0.015) 13px
    ),
    linear-gradient(180deg, #0D1B2A 0%, #0A1E3F 100%);
  border-right: 1px solid var(--c-border);
}

.site-header__top {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.brand__logo {
  position: relative;
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.5px;
  padding: 4px 10px;
  background: var(--gradient-accent);
  border-radius: 10px;
  color: #fff;
  display: inline-flex;
  align-items: center;
  box-shadow: 0 4px 16px rgba(255, 107, 0, 0.28);
  flex-shrink: 0;
}

.brand__logo::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  border: 2px solid var(--c-primary);
  box-shadow: 0 0 8px rgba(0, 230, 118, 0.5);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  min-width: 0;
}

.brand__name {
  font-size: 17px;
  font-weight: 800;
  color: var(--c-text-bright);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand__sub {
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--c-text-dim);
  font-family: var(--font-number);
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  transition: background 0.2s, border-color 0.2s;
}

.nav-toggle:hover {
  border-color: var(--c-border-strong);
  background: rgba(255, 255, 255, 0.05);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-text-bright);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

.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);
}

.site-nav {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.site-nav::-webkit-scrollbar {
  width: 4px;
}

.site-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.18);
  border-radius: 4px;
}

.site-nav::-webkit-scrollbar-track {
  background: transparent;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--c-text-dim);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.2s, color 0.2s, transform 0.2s;
}

.site-nav__link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--c-text-bright);
}

.site-nav__link:hover .site-nav__idx {
  color: var(--c-accent);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 6px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease), opacity 0.2s;
  opacity: 0;
}

.site-nav__link:hover::after {
  transform: scaleX(1);
  opacity: 1;
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 107, 0, 0.16), rgba(255, 107, 0, 0.04));
  color: var(--c-accent);
  font-weight: 700;
}

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  border-radius: 0 4px 4px 0;
  background: var(--gradient-accent);
}

.site-nav__link[aria-current="page"]::after {
  display: none;
}

.site-nav__idx {
  font-family: var(--font-number);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.32);
  min-width: 20px;
  transition: color 0.2s;
}

.site-nav__label {
  font-weight: inherit;
  letter-spacing: 0.01em;
}

.site-nav__cta {
  flex-shrink: 0;
  margin-top: auto;
  text-decoration: none;
  text-align: center;
  margin-bottom: 12px;
}

.site-header__meta {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 2px 24px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
  border-top: 1px solid var(--c-border);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.15);
  animation: status-pulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}

@keyframes status-pulse {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(0, 230, 118, 0.15);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(0, 230, 118, 0.06);
  }
}

.site-header__meta-text {
  white-space: nowrap;
}

.scroll-progress {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: rgba(255, 255, 255, 0.05);
  pointer-events: none;
}

.scroll-progress::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--c-accent), var(--c-success));
  transform: scaleY(var(--scroll-progress, 0));
  transform-origin: top left;
  border-radius: 0 3px 3px 0;
}

.site-footer {
  margin-left: var(--sidebar-w);
  background: var(--c-footer-bg);
  border-top: 1px solid var(--c-border);
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 32px 48px;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.site-footer__logo {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  color: var(--c-text-bright);
  text-decoration: none;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.site-footer__logo-num {
  font-family: var(--font-number);
  color: var(--c-accent);
  font-weight: 700;
}

.site-footer__desc {
  color: var(--c-text-dim);
  font-size: 13px;
  line-height: 1.7;
  max-width: 32ch;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.site-footer__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-bright);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list a {
  color: var(--c-text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s, padding-left 0.2s;
}

.site-footer__list a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}

.site-footer__list--contact {
  font-size: 14px;
  color: var(--c-text-dim);
  line-height: 1.7;
}

.site-footer__bottom {
  border-top: 1px solid var(--c-border);
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-text-dim);
  text-align: center;
}

.site-footer__icp {
  font-family: var(--font-number);
  letter-spacing: 0.04em;
}

.site-footer__trust {
  max-width: 640px;
  font-size: 12px;
  opacity: 0.75;
  color: var(--c-text-dim);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 48px 0;
}

.section__head {
  margin-bottom: 32px;
  max-width: 720px;
}

.section__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255, 107, 0, 0.14);
  color: var(--c-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text-bright);
}

.section__subtitle {
  margin-top: 12px;
  color: var(--c-text-dim);
  font-size: 16px;
}

.page-hero {
  padding: 64px 0 56px;
  position: relative;
}

.page-hero__index {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-number);
  font-size: 13px;
  letter-spacing: 0.26em;
  color: var(--c-accent);
  text-transform: uppercase;
}

.page-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(48px, 6vw, 88px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-text-bright);
}

.page-hero__title--outline {
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(255, 255, 255, 0.3);
}

.page-hero__desc {
  margin-top: 20px;
  max-width: 62ch;
  color: var(--c-text-dim);
  font-size: 16px;
}

.grid--2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid--3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid--4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: var(--c-primary-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  background: #244568;
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.28);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-text-bright);
  margin-bottom: 8px;
}

.card__body {
  color: var(--c-text-dim);
  font-size: 14px;
  line-height: 1.7;
}

.media {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background:
    linear-gradient(135deg, var(--c-primary-light), var(--c-primary));
}

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

.media--4-3 {
  aspect-ratio: 4 / 3;
}

.media--1-1 {
  aspect-ratio: 1 / 1;
}

.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__value {
  font-family: var(--font-number);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-text-bright);
  letter-spacing: -0.02em;
}

.stat__label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-body);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s, border-color 0.2s, color 0.2s;
}

.btn--primary {
  background: var(--gradient-accent);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(255, 107, 0, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 107, 0, 0.36);
}

.btn--secondary {
  background: transparent;
  color: var(--c-text-bright);
  border-color: var(--c-border-strong);
}

.btn--secondary:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 8px 18px;
  font-size: 13px;
}

.btn--lg {
  padding: 16px 40px;
  font-size: 16px;
}

.btn--block {
  display: flex;
  width: 100%;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-size: 13px;
  color: var(--c-text-dim);
}

.breadcrumb__link {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb__link:hover {
  color: var(--c-accent);
}

.breadcrumb__sep {
  opacity: 0.45;
  font-family: var(--font-number);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  color: var(--c-text-bright);
}

.tag--accent {
  background: rgba(255, 107, 0, 0.16);
  color: var(--c-accent);
}

.tag--success {
  background: rgba(0, 230, 118, 0.12);
  color: var(--c-success);
}

.diag-lines {
  background:
    radial-gradient(ellipse at 70% 20%, rgba(255, 107, 0, 0.08), transparent 50%),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 18px,
      rgba(255, 255, 255, 0.02) 18px,
      rgba(255, 255, 255, 0.02) 19px
    ),
    var(--c-primary);
}

@media (max-width: 1023px) {
  #main-content,
  .site-footer {
    margin-left: 0;
  }

  .site-header {
    position: sticky;
    top: 0;
    bottom: auto;
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid var(--c-border);
    background:
      linear-gradient(180deg, #0D1B2A 0%, #0A1E3F 100%);
  }

  .site-header__top {
    width: 100%;
    padding: 0;
    margin: 0;
    border-bottom: none;
    height: var(--header-h-mobile);
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h-mobile);
    left: 0;
    bottom: 0;
    width: 320px;
    max-width: 85vw;
    z-index: 900;
    background: var(--c-primary);
    padding: 24px 20px;
    transform: translateX(-105%);
    transition: transform 0.32s var(--ease);
    box-shadow: 4px 0 28px rgba(0, 0, 0, 0.35);
    border-right: 1px solid var(--c-border);
  }

  .site-nav[data-open] {
    transform: translateX(0);
  }

  .site-nav__cta {
    margin-top: auto;
  }

  .site-header__meta {
    display: none;
  }

  .scroll-progress {
    position: absolute;
    top: auto;
    right: 0;
    bottom: -3px;
    left: 0;
    width: auto;
    height: 3px;
    background: rgba(255, 255, 255, 0.05);
  }

  .scroll-progress::before {
    width: 100%;
    height: 100%;
    border-radius: 0;
    transform: scaleX(var(--scroll-progress, 0));
    transform-origin: top left;
  }

  .site-footer {
    border-top: 1px solid var(--c-border);
  }
}

@media (max-width: 640px) {
  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 20px 28px;
  }

  .site-footer__bottom {
    padding: 20px 16px;
  }

  .brand__logo {
    font-size: 18px;
    padding: 3px 8px;
    border-radius: 8px;
  }

  .brand__name {
    font-size: 15px;
  }

  .brand__sub {
    font-size: 9px;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .card {
    padding: 24px;
  }

  .section {
    padding: 32px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .status-dot,
  .nav-toggle__bar,
  .site-nav__link,
  .btn,
  .card {
    animation: none;
  }
}