:root {
  --c-primary: #0B1B3A;
  --c-primary-deep: #060F24;
  --c-accent: #39FF88;
  --c-accent-soft: rgba(57, 255, 136, 0.14);
  --c-accent-faint: rgba(57, 255, 136, 0.07);
  --c-gold: #FFC24B;
  --c-milk: #F5F0E8;
  --c-rock: #4A5568;
  --c-moss: #6B8E23;
  --c-terra: #D97B5C;
  --c-carbon: #2D3748;
  --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-20: 1.25rem;
  --fs-24: 1.5rem;
  --fs-32: 2rem;
  --fs-48: 3rem;
  --fs-64: 4rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --container-w: 1280px;
  --header-h: 4.5rem;
  --glass-bg: rgba(11, 27, 58, 0.72);
  --glass-border: rgba(245, 240, 232, 0.12);
  --glass-blur: blur(18px) saturate(140%);
  --shadow-soft: 0 2px 12px rgba(6, 15, 36, 0.1);
  --shadow-md: 0 12px 32px rgba(6, 15, 36, 0.2);
  --shadow-glow: 0 0 28px rgba(57, 255, 136, 0.35);
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-pill: 999px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.6;
  background: var(--c-primary);
  color: var(--c-milk);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.25;
  color: var(--c-primary);
  text-wrap: balance;
}

strong,
b {
  font-weight: 700;
}

::selection {
  background: var(--c-accent);
  color: var(--c-primary);
}

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

.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: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.5rem;
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 700;
  font-size: var(--fs-14);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
  transition: top 0.3s var(--ease-out);
}

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

.container-bs {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

#main-content {
  display: block;
  min-height: 60vh;
  background: var(--c-milk);
  color: var(--c-primary);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}

@supports not ((-webkit-backdrop-filter: blur(18px)) or (backdrop-filter: blur(18px))) {
  .site-header {
    background: rgba(11, 27, 58, 0.96);
  }
}

.site-header__bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--header-h);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  z-index: 5;
  box-shadow: 0 0 10px rgba(57, 255, 136, 0.55);
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
}

.brand-mark__link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.brand-mark__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.625rem;
  background: var(--c-accent);
  color: var(--c-primary);
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 0 0 1px rgba(57, 255, 136, 0.3), 0 4px 14px rgba(57, 255, 136, 0.25);
}

.brand-mark__word {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-milk);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.5rem;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--c-accent-faint);
  border: 1px solid rgba(57, 255, 136, 0.22);
}

.header-status__led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(57, 255, 136, 0.8);
  animation: led-pulse 2s ease-in-out infinite;
}

.header-status__text {
  font-size: var(--fs-12);
  font-weight: 600;
  color: rgba(245, 240, 232, 0.85);
  letter-spacing: 0.08em;
}

@keyframes led-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 8px rgba(57, 255, 136, 0.8);
  }
  50% {
    opacity: 0.55;
    box-shadow: 0 0 4px rgba(57, 255, 136, 0.35);
  }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  margin-left: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(245, 240, 232, 0.16);
  background: rgba(245, 240, 232, 0.06);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.nav-toggle:hover {
  background: var(--c-accent-soft);
  border-color: rgba(57, 255, 136, 0.35);
}

.nav-toggle__line {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 2px;
  background: var(--c-milk);
  transition: transform 0.25s var(--ease-out), opacity 0.2s ease;
}

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

.nav-tags {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  margin-left: auto;
  padding: 0.25rem;
  border-radius: var(--radius-pill);
  background: rgba(245, 240, 232, 0.06);
  border: 1px solid rgba(245, 240, 232, 0.09);
}

.nav-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-pill);
  font-size: var(--fs-14);
  font-weight: 500;
  color: rgba(245, 240, 232, 0.78);
  white-space: nowrap;
  transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.nav-tag:hover {
  background: var(--c-accent-soft);
  color: var(--c-accent);
}

.nav-tag[aria-current="page"] {
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 700;
  box-shadow: var(--shadow-glow);
}

.site-footer {
  position: relative;
  background: var(--c-carbon);
  color: var(--c-milk);
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-gold) 55%, var(--c-terra) 100%);
  opacity: 0.9;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--space-7);
  padding: var(--space-8) 0 var(--space-7);
}

.footer-brand__note {
  margin-top: 1rem;
  font-size: var(--fs-14);
  color: rgba(245, 240, 232, 0.6);
  line-height: 1.7;
  max-width: 340px;
}

.footer-brand__icp {
  margin-top: 0.75rem;
  font-size: var(--fs-12);
  color: rgba(245, 240, 232, 0.4);
  letter-spacing: 0.04em;
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.1rem;
  font-size: var(--fs-14);
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-col__title::before {
  content: '';
  width: 1.5rem;
  height: 2px;
  background: var(--c-accent);
  flex-shrink: 0;
}

.footer-links li {
  margin-bottom: 0.625rem;
}

.footer-links a {
  color: rgba(245, 240, 232, 0.72);
  font-size: var(--fs-15);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-links a:hover {
  color: var(--c-accent);
  padding-left: 0.25rem;
}

.footer-links--contact li {
  margin-bottom: 1rem;
}

.footer-contact__item {
  font-size: var(--fs-14);
  line-height: 1.5;
  color: rgba(245, 240, 232, 0.7);
  word-break: break-all;
}

.footer-contact__label {
  display: block;
  font-size: var(--fs-12);
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 0.06em;
  margin-bottom: 0.125rem;
}

.site-footer__bottom {
  border-top: 1px solid rgba(245, 240, 232, 0.1);
  background: rgba(6, 15, 36, 0.5);
  padding: 1.25rem 0;
}

.site-footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-size: var(--fs-14);
  color: rgba(245, 240, 232, 0.55);
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-legal a {
  color: rgba(245, 240, 232, 0.55);
  font-size: var(--fs-13);
  transition: color 0.2s ease;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  background: var(--c-accent);
  color: var(--c-primary);
  font-weight: 700;
  font-size: var(--fs-16);
  line-height: 1;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary::after {
  content: '→';
  font-size: 1.125em;
  line-height: 1;
  transition: transform 0.2s ease;
}

.btn-primary:hover {
  background: #4dff9a;
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.btn-primary:hover::after {
  transform: translateX(4px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(11, 27, 58, 0.28);
  color: var(--c-primary);
  font-weight: 600;
  font-size: var(--fs-16);
  line-height: 1;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn-ghost:hover {
  background: rgba(11, 27, 58, 0.05);
  border-color: var(--c-primary);
  transform: translateY(-2px);
}

.glass-panel {
  background: rgba(11, 27, 58, 0.08);
  border: 1px solid rgba(11, 27, 58, 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.glass-panel--dark {
  background: rgba(245, 240, 232, 0.07);
  border-color: rgba(245, 240, 232, 0.14);
  color: var(--c-milk);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: var(--fs-12);
  font-weight: 600;
  background: rgba(11, 27, 58, 0.08);
  color: var(--c-primary);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.data-chip--accent {
  background: var(--c-accent-soft);
  color: var(--c-primary);
}

.data-chip--dark {
  background: rgba(245, 240, 232, 0.08);
  color: var(--c-milk);
}

.stat-num {
  font-family: var(--font-heading);
  font-size: var(--fs-64);
  font-weight: 900;
  line-height: 0.95;
  color: var(--c-gold);
  font-feature-settings: "tnum";
  letter-spacing: -0.02em;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.section-head__title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--fs-32);
  font-weight: 900;
  color: var(--c-primary);
  line-height: 1.15;
}

.section-head__tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-primary);
  background: var(--c-accent-soft);
}

.crumb-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  font-size: var(--fs-14);
  color: var(--c-rock);
  margin-bottom: var(--space-6);
}

.crumb-nav a {
  color: var(--c-rock);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(74, 85, 104, 0.35);
  transition: color 0.2s ease;
}

.crumb-nav a:hover {
  color: var(--c-primary);
}

.crumb-nav__sep {
  color: rgba(74, 85, 104, 0.4);
  margin: 0 0.25rem;
}

.crumb-nav__cur {
  color: var(--c-primary);
  font-weight: 600;
}

.page-title {
  font-size: clamp(2rem, 5vw, var(--fs-64));
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-primary);
}

.text-lede {
  font-size: var(--fs-20);
  line-height: 1.65;
  color: var(--c-rock);
  max-width: 60rem;
}

.term-line {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.28em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: rgba(11, 27, 58, 0.45);
  text-transform: uppercase;
  white-space: nowrap;
}

.term-line--light {
  color: rgba(245, 240, 232, 0.5);
}

.img-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, rgba(11, 27, 58, 0.08), rgba(74, 85, 104, 0.1));
  border: 1px solid rgba(11, 27, 58, 0.1);
}

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

.img-frame--portrait {
  aspect-ratio: 3 / 4;
}

.img-frame::after {
  content: 'IMAGE SLOT';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(11, 27, 58, 0.35);
}

.img-frame--dark {
  background: linear-gradient(135deg, rgba(11, 27, 58, 0.4), rgba(6, 15, 36, 0.6));
  border-color: rgba(245, 240, 232, 0.14);
}

.img-frame--dark::after {
  color: rgba(245, 240, 232, 0.4);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
}

.section-block {
  padding: var(--space-8) 0;
}

.section-block--tight {
  padding: var(--space-6) 0;
}

.section-block--dark {
  background: var(--c-primary);
  color: var(--c-milk);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

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

.stagger-1 { --reveal-delay: 80ms; }
.stagger-2 { --reveal-delay: 160ms; }
.stagger-3 { --reveal-delay: 240ms; }
.stagger-4 { --reveal-delay: 320ms; }

.back-top-btn {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--c-primary);
  border: 1px solid rgba(57, 255, 136, 0.4);
  color: var(--c-accent);
  box-shadow: 0 4px 16px rgba(6, 15, 36, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

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

.back-top-btn:hover {
  background: var(--c-accent);
  color: var(--c-primary);
  box-shadow: var(--shadow-glow);
}

@media (max-width: 1080px) {
  .header-status {
    display: none;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav-tags {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: var(--space-4);
    left: var(--space-4);
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    margin-left: 0;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    background: rgba(6, 15, 36, 0.96);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    border-color: rgba(245, 240, 232, 0.14);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

  .nav-tags[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-tag {
    justify-content: flex-start;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    font-size: var(--fs-16);
  }

  .nav-tag[aria-current="page"] {
    box-shadow: none;
  }
}

@media (max-width: 600px) {
  :root {
    --header-h: 3.75rem;
  }

  .brand-mark__icon {
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1.4rem;
    border-radius: 0.5rem;
  }

  .brand-mark__word {
    font-size: 1.0625rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    padding: var(--space-7) 0 var(--space-6);
  }

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

  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal {
    justify-content: center;
    gap: 1rem;
  }

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

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .back-top-btn {
    right: 1rem;
    bottom: 1rem;
    width: 2.75rem;
    height: 2.75rem;
  }
}

@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;
    transition-delay: 0ms !important;
  }

  .header-status__led {
    animation: none;
  }

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

  .back-top-btn,
  .btn-primary,
  .btn-ghost,
  .nav-tag,
  .nav-toggle {
    transition: none;
  }
}