/* ============ 1. Variables ============ */
:root {
  --blue-deep: #0B1B3A;
  --blue-secondary: #1E3A6E;
  --orange: #FF6B35;
  --green: #39FF14;
  --moon-white: #F4F7FC;
  --line-gray: #D0D6E0;
  --ink: #111827;
  --white: #FFFFFF;
  --white-trans: rgba(255, 255, 255, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, "Cascadia Mono", "Segoe UI Mono", Consolas, monospace;

  --container-w: 1240px;
  --container-pad: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 24px rgba(11, 27, 58, 0.1);
}

/* ============ 2. Reset ============ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background-color: var(--moon-white);
  background-image:
    linear-gradient(rgba(11, 27, 58, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 27, 58, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

main {
  display: block;
  flex: 1 0 auto;
  width: 100%;
}

/* ============ 3. Accessibility ============ */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 0;
  left: -9999px;
  z-index: 3000;
  display: inline-block;
  padding: 12px 24px;
  background: var(--orange);
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 6px 0;
  box-shadow: 0 4px 16px rgba(11, 27, 58, 0.25);
}

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

.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;
}

/* ============ 4. Layout Containers ============ */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.container--narrow {
  max-width: 820px;
}

.container--wide {
  max-width: 1440px;
}

/* ============ 5. Scroll Progress ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--orange));
  z-index: 2500;
  pointer-events: none;
  transition: width 0.1s linear;
}

/* ============ 6. Header ============ */
.site-header {
  position: relative;
  background: var(--blue-deep);
  color: var(--white);
  border-bottom: 3px solid var(--orange);
  z-index: 1000;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

/* ============ 7. Masthead ============ */
.masthead {
  position: relative;
  z-index: 1;
  padding: 28px 0 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.masthead-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.4;
}

.meta-coord {
  position: relative;
  padding-left: 16px;
}

.meta-coord::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border: 1.5px solid var(--green);
  border-radius: 1px;
}

.brand-mark {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-self: center;
  text-align: center;
  transition: opacity var(--transition);
}

.brand-mark:hover {
  opacity: 0.85;
}

.brand-logo {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 6px;
  line-height: 1.4;
  color: var(--green);
  text-transform: uppercase;
}

.brand-line {
  font-family: var(--font-sans);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  letter-spacing: 4px;
  line-height: 1.15;
  color: var(--white);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 8px;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.65);
  text-transform: uppercase;
  margin-top: 2px;
}

.masthead-actions {
  display: flex;
  justify-content: flex-end;
  justify-self: end;
}

.quick-search {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--white-trans);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 4px;
  color: var(--white);
  text-align: left;
  transition: border-color var(--transition), background var(--transition);
}

.quick-search:hover {
  border-color: var(--green);
  background: rgba(255, 255, 255, 0.18);
}

.quick-search-icon {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--green);
  border-radius: 50%;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.quick-search-icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 5px;
  height: 2px;
  background: var(--green);
  transform: rotate(45deg);
}

.quick-search:hover .quick-search-icon {
  transform: rotate(90deg);
}

.quick-search-text {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
}

.quick-search-tip {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.5);
  white-space: nowrap;
}

/* ============ 8. Primary Navigation ============ */
.primary-nav {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(11, 27, 58, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 56px;
}

.nav-toggle {
  display: none;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list a {
  display: block;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.8);
  white-space: nowrap;
  transition: color var(--transition);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 10px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition);
}

.nav-list a {
  position: relative;
}

.nav-list a:hover {
  color: var(--white);
}

.nav-list a:hover::after {
  transform: scaleX(1);
}

.nav-list a[aria-current="page"] {
  color: var(--orange);
}

.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ============ 9. Footer ============ */
.site-footer {
  margin-top: auto;
  background: var(--blue-deep);
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 40px;
}

.footer-brand {
  align-self: start;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--green);
  line-height: 1.4;
  margin-bottom: 8px;
}

.footer-brand-line {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 2px;
  line-height: 1.3;
  color: var(--white);
}

.footer-tagline {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
  max-width: 300px;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--orange);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 8px;
  margin-bottom: 14px;
}

.footer-nav ul,
.footer-docs ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-nav a,
.footer-docs a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
  font-size: 14px;
  line-height: 1.5;
}

.footer-nav a:hover,
.footer-docs a:hover {
  color: var(--orange);
}

.footer-contact-line {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  flex-shrink: 0;
  min-width: 32px;
}

.footer-contact-btn {
  margin-top: 14px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.18);
  padding: 14px 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
}

/* ============ 10. Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--orange);
  color: var(--blue-deep);
}

.btn-primary:hover {
  background: #ff5f1f;
  color: var(--blue-deep);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.btn-accent {
  background: var(--green);
  color: var(--blue-deep);
}

.btn-accent:hover {
  background: #2dff0e;
  color: var(--blue-deep);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(57, 255, 20, 0.3);
}

.btn-ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--white);
}

.btn-ghost:hover {
  border-color: var(--green);
  color: var(--green);
  background: rgba(255, 255, 255, 0.05);
}

.btn-small {
  padding: 8px 16px;
  font-size: 13px;
}

/* ============ 11. Breadcrumbs ============ */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

.breadcrumbs a {
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition);
}

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

.breadcrumbs .bc-sep {
  color: rgba(255, 255, 255, 0.3);
}

.breadcrumbs .bc-current {
  color: var(--green);
}

/* ============ 12. Page Header ============ */
.page-header {
  position: relative;
  padding: 32px 0 16px;
  border-bottom: 1px solid var(--line-gray);
  margin-bottom: 32px;
}

.page-subtitle {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 6px;
}

.page-title {
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 900;
  line-height: 1.25;
  color: var(--blue-deep);
}

.page-header--dark {
  background: var(--blue-deep);
  color: var(--white);
  border-bottom: none;
  padding: 48px 0 32px;
}

.page-header--dark .page-title {
  color: var(--white);
}

.page-header--dark .page-subtitle {
  color: var(--green);
}

/* ============ 13. Section Tag ============ */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border: 1px solid var(--orange);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--orange);
}

/* ============ 14. Data Cards ============ */
.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.data-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-gray);
  border-radius: 8px;
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}

.data-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(11, 27, 58, 0.14);
}

.data-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--orange);
  margin-bottom: 10px;
  padding: 2px 8px;
  background: rgba(255, 107, 53, 0.08);
  border-radius: 2px;
}

/* ============ 15. Glass Card ============ */
.glass-card {
  background: var(--white-trans);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 12px;
  padding: 24px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--white);
}

/* ============ 16. Filter Bar ============ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.filter-btn {
  padding: 8px 18px;
  border: 1px solid var(--line-gray);
  border-radius: 4px;
  background: var(--white);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.filter-btn.is-active {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
  color: var(--white);
  box-shadow: 0 2px 10px rgba(11, 27, 58, 0.2);
}

.filter-btn.is-active:hover {
  color: var(--white);
}

/* ============ 17. Image Frames ============ */
.img-frame {
  position: relative;
  overflow: hidden;
  background: var(--blue-deep);
  border-radius: 8px;
}

.img-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.img-frame--portrait::before {
  padding-top: 133%;
}

.img-frame--landscape::before {
  padding-top: 66.66%;
}

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

/* ============ 18. Reveal ============ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* ============ 19. Back to Top ============ */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--orange);
  border: none;
  border-radius: 6px;
  color: var(--blue-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.4);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
}

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

.back-top:hover {
  background: #ff5f1f;
  transform: translateY(-3px);
}

.back-top-arrow {
  font-size: 18px;
  line-height: 1;
}

/* ============ 20. Responsive ============ */
@media (max-width: 1024px) {
  .masthead-inner {
    grid-template-columns: 1fr auto;
  }

  .masthead-meta {
    display: none;
  }

  .brand-mark {
    justify-self: start;
  }

  .masthead-actions {
    justify-self: end;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .footer-tagline {
    max-width: 480px;
  }
}

@media (max-width: 840px) {
  .nav-inner {
    position: static;
    justify-content: flex-start;
    min-height: 52px;
    padding: 0;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 52px;
    padding: 0 16px;
    background: none;
    border: none;
    color: var(--white);
  }

  .nav-toggle-box {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 20px;
    height: 16px;
  }

  .nav-toggle-bar {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--white);
    border-radius: 1px;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-toggle-label {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 2px;
    color: rgba(255, 255, 255, 0.7);
  }

  .primary-nav[data-open] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .primary-nav[data-open] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .primary-nav[data-open] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--blue-deep);
    border-bottom: 2px solid var(--orange);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  }

  .primary-nav[data-open] .nav-list {
    display: flex;
  }

  .nav-list a {
    padding: 14px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 15px;
  }

  .nav-list a::after {
    display: none;
  }

  .nav-list a[aria-current="page"] {
    color: var(--orange);
  }
}

@media (max-width: 768px) {
  :root {
    --container-pad: 16px;
  }

  .masthead {
    padding: 20px 0 16px;
  }

  .masthead-inner {
    grid-template-columns: 1fr;
    gap: 8px;
    text-align: center;
  }

  .brand-mark {
    justify-self: center;
  }

  .brand-logo {
    font-size: 10px;
    letter-spacing: 4px;
  }

  .brand-line {
    font-size: 26px;
    letter-spacing: 2px;
  }

  .brand-sub {
    font-size: 12px;
    letter-spacing: 5px;
  }

  .masthead-actions {
    justify-self: center;
    margin-top: 8px;
  }

  .quick-search {
    width: 100%;
    justify-content: center;
    padding: 10px 14px;
  }

  .quick-search-tip {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 40px;
    padding-bottom: 28px;
  }

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

  .footer-bottom-inner {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .back-top {
    bottom: 20px;
    right: 20px;
    padding: 10px 14px;
  }

  .back-top-text {
    display: none;
  }
}

/* ============ 21. Reduced Motion ============ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-progress {
    transition: none;
  }

  .back-top {
    transition: opacity 0.01ms linear;
  }
}