/* ========== 1. Reset ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

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

ul,
ol {
  list-style: none;
}

/* ========== 2. Variables ========== */
:root {
  --color-primary: #0B1D3A;
  --color-primary-dark: #061020;
  --color-surface: #142A4A;
  --color-surface-light: #1D3A5F;
  --color-accent-orange: #FF6A00;
  --color-accent-green: #C6FF00;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B0C4DE;
  --color-text-muted: #7A8FA6;
  --color-border: #24456A;

  --font-headlines: "Archivo Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-numbers: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --header-height-desktop: 64px;
  --header-height-mobile: 56px;
  --container-max: 1280px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.25s ease;
}

/* ========== 3. Base ========== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  padding-top: 96px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body > .site-footer {
  margin-top: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

#main-content {
  scroll-margin-top: 88px;
  flex: 1;
}

/* ========== 4. Layout ========== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding: 72px 0;
}

.section-tight {
  padding: 40px 0;
}

.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;
}

.img-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
}

.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 29, 58, 0.35), transparent 60%);
  pointer-events: none;
}

/* ========== 5. Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform 0.15s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--color-accent-orange);
  color: var(--color-primary-dark);
  border-color: var(--color-accent-orange);
}

.btn-primary:hover {
  background: #ff8433;
  border-color: #ff8433;
}

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

.btn-ghost:hover {
  border-color: var(--color-accent-green);
  color: var(--color-accent-green);
}

/* ========== 6. Skip Link ========== */
.skip-link {
  position: fixed;
  top: -56px;
  left: 16px;
  z-index: 3000;
  padding: 12px 20px;
  background: var(--color-accent-green);
  color: var(--color-primary-dark);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.875rem;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
}

/* ========== 7. Scroll Progress ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2000;
  background: linear-gradient(90deg, var(--color-accent-orange), var(--color-accent-green));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

/* ========== 8. Header ========== */
.site-header {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  width: calc(100% - 24px);
  max-width: var(--container-max);
  background: rgba(11, 29, 58, 0.88);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border: 1px solid rgba(36, 69, 106, 0.6);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(6, 16, 32, 0.45);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 8px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  flex-shrink: 0;
}

.brand-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-accent-orange) 0%, var(--color-accent-orange) 49.9%, var(--color-accent-green) 50%, var(--color-accent-green) 100%);
  clip-path: polygon(50% 0%, 62% 35%, 98% 35%, 70% 57%, 81% 91%, 50% 72%, 19% 91%, 30% 57%, 2% 35%, 38% 35%);
}

.brand-name {
  font-family: var(--font-headlines);
  font-size: 1.125rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  white-space: nowrap;
}

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

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  line-height: 1.3;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  background: rgba(198, 255, 0, 0.1);
  color: var(--color-text-primary);
}

.nav-link[aria-current="page"] {
  background: rgba(198, 255, 0, 0.14);
  color: var(--color-accent-green);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: 3px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent-green);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--color-accent-orange);
  color: var(--color-primary-dark);
  font-size: 0.8125rem;
  font-weight: 700;
  white-space: nowrap;
  transition: background var(--transition-fast), transform 0.15s ease;
  flex-shrink: 0;
}

.header-cta:hover {
  background: #ff8433;
  transform: translateY(-1px);
}

.cta-text {
  display: inline-block;
  position: relative;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  flex-shrink: 0;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent-green);
  background: var(--color-surface-light);
}

.toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.toggle-bar + .toggle-bar {
  margin-top: 4px;
}

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

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

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

.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;
}

/* ========== 9. Footer ========== */
.site-footer {
  position: relative;
  background: var(--color-primary-dark);
  border-top: 1px solid var(--color-border);
  background-image:
    linear-gradient(rgba(36, 69, 106, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 69, 106, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-orange) 0%, transparent 30%, transparent 70%, var(--color-accent-green) 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
  padding: 56px 0 40px;
}

.footer-brand-block .brand {
  margin-bottom: 16px;
}

.footer-tagline {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: 10px;
}

.footer-note {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  line-height: 1.5;
  max-width: 320px;
  border-left: 2px solid var(--color-border);
  padding-left: 12px;
}

.footer-links,
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-title {
  font-family: var(--font-headlines);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  position: relative;
}

.footer-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent-orange);
}

.footer-link {
  display: block;
  padding: 5px 0;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-accent-green);
  padding-left: 4px;
}

.footer-item {
  display: block;
  position: relative;
  padding: 5px 0 5px 14px;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-orange);
  opacity: 0.7;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 0 20px;
  border-top: 1px solid rgba(36, 69, 106, 0.5);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer-copy {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.footer-icp {
  font-family: var(--font-numbers);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

/* ========== 10. Page Components ========== */
.page-hero {
  position: relative;
  padding: 140px 0 64px;
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-surface) 100%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(36, 69, 106, 0.3) 100%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: var(--color-accent-green);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  opacity: 0.12;
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-headlines);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 900;
  color: var(--color-text-primary);
  line-height: 1.1;
  text-transform: uppercase;
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.6;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.breadcrumbs span[aria-hidden="true"] {
  color: var(--color-border);
}

.breadcrumbs span[aria-current="page"] {
  color: var(--color-text-muted);
}

/* ========== 11. Section Headers ========== */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.section-index {
  font-family: var(--font-numbers);
  font-size: 0.75rem;
  color: var(--color-accent-orange);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}

.section-title {
  font-family: var(--font-headlines);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 900;
  color: var(--color-text-primary);
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

/* ========== 12. Data Components ========== */
.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.data-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.data-card:hover {
  border-color: var(--color-accent-green);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(6, 16, 32, 0.35);
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 32px;
  background: var(--color-accent-orange);
  border-radius: 0 0 4px 0;
}

.data-number {
  display: block;
  font-family: var(--font-numbers);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.data-label {
  display: block;
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

/* ========== 13. Reveal ========== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  transition-delay: var(--reveal-delay, 0s);
}

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

/* ========== 14. Responsive ========== */
@media (max-width: 992px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 767px) {
  body {
    padding-top: 76px;
  }

  html {
    scroll-padding-top: 84px;
  }

  .site-header {
    top: 12px;
    width: calc(100% - 16px);
    border-radius: 16px;
  }

  .header-inner {
    padding: 6px 8px 6px 14px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-mark {
    width: 24px;
    height: 24px;
  }

  .header-cta {
    padding: 8px 14px;
    font-size: 0.75rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin-left: 0;
    padding: 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 16px 40px rgba(6, 16, 32, 0.55);
  }

  .js .header-nav {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

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

  .nav-link {
    display: block;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.9375rem;
  }

  .nav-link[aria-current="page"]::after {
    bottom: 4px;
  }

  .section {
    padding: 48px 0;
  }

  .page-hero {
    padding: 108px 0 48px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 40px 0 32px;
  }

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

  .footer-note {
    max-width: 100%;
  }

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

  .container {
    padding-inline: 16px;
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .header-cta {
    padding: 8px 12px;
    font-size: 0.75rem;
  }

  .brand-gap {
    gap: 6px;
  }
}

/* ========== 15. 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;
  }

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

  .js .header-nav {
    transition: none;
  }

  .header-cta:hover {
    transform: none;
  }

  .data-card:hover {
    transform: none;
  }
}