/* =============================
   1. Design Tokens
   ============================= */
:root {
  --deep-space: #0B1D3A;
  --dark-background: #050B18;
  --neon-green: #39FF88;
  --orange-red: #FF7A18;
  --light-background: #F5F7FA;
  --text-light: #FFFFFF;
  --text-secondary: #B0C4DE;
  --border-line: #2E4A7D;
  --gray-text: #6C7A8A;
  --glow-gradient: linear-gradient(135deg, #39FF88, #FF7A18);

  --heading-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --body-family: 'Inter', 'Noto Sans SC', sans-serif;

  --container-max: 1200px;
  --container-pad: 1.25rem;
  --radius: 4px;
  --transition-fast: 0.2s ease;
  --transition-mid: 0.35s ease;
}

/* =============================
   2. Reset & Base
   ============================= */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--body-family);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-light);
  background-color: var(--deep-space);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--heading-family);
  line-height: 1.15;
  font-weight: 700;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

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

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

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

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

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.section-light {
  background-color: var(--light-background);
  color: var(--gray-text);
}

.section-light .section-title {
  color: var(--deep-space);
}

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

/* =============================
   4. Header
   ============================= */
.site-header {
  position: relative;
  background-color: var(--deep-space);
  border-bottom: 1px solid var(--border-line);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: var(--glow-gradient);
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 999;
  padding: 0.6rem 1.2rem;
  background-color: var(--neon-green);
  color: var(--dark-background);
  font-family: var(--heading-family);
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 0 0 var(--radius) var(--radius);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 3px;
}

.masthead {
  border-bottom: 1px solid var(--border-line);
  background:
    linear-gradient(110deg, rgba(57, 255, 136, 0.05) 0%, transparent 42%),
    var(--deep-space);
}

.masthead-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem var(--container-pad) 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.masthead-brand {
  display: flex;
  align-items: center;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
}

.brand-kok {
  font-family: var(--heading-family);
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--text-light);
  -webkit-text-stroke: 1px rgba(57, 255, 136, 0.85);
  text-shadow: 0 0 20px rgba(57, 255, 136, 0.4);
}

.brand-cn {
  font-family: var(--heading-family);
  font-size: clamp(0.95rem, 2vw, 1.3rem);
  font-weight: 700;
  color: var(--neon-green);
  letter-spacing: 0.18em;
  padding-left: 0.5rem;
}

.masthead-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.3rem;
}

.masthead-label {
  font-family: var(--heading-family);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  color: var(--neon-green);
  text-transform: uppercase;
}

.masthead-edition {
  font-family: var(--heading-family);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  border: 1px solid var(--border-line);
  padding: 0.12rem 0.5rem;
  border-radius: 2px;
}

/* =============================
   5. Navigation
   ============================= */
.nav-panel {
  background-color: rgba(5, 11, 24, 0.85);
  border-bottom: 1px solid var(--border-line);
}

.nav-panel-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 54px;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 0;
}

.nav-item {
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: 0.95rem 1.15rem;
  font-family: var(--heading-family);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--neon-green);
  background-color: rgba(57, 255, 136, 0.05);
}

.nav-link[aria-current="page"] {
  color: var(--neon-green);
  border-bottom-color: var(--neon-green);
  text-shadow: 0 0 14px rgba(57, 255, 136, 0.35);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  background: transparent;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--neon-green);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--neon-green);
  background-color: rgba(57, 255, 136, 0.08);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--neon-green);
  margin: 3px auto;
  border-radius: 2px;
  transition: transform var(--transition-mid), opacity var(--transition-mid);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(5px) 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(-5px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-panel-inner {
    flex-wrap: wrap;
    justify-content: flex-end;
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-basis: 100%;
    order: 5;
  }

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

  .site-nav ul {
    flex-direction: column;
    border-top: 1px solid var(--border-line);
    padding: 0.35rem 0;
  }

  .nav-link {
    padding: 0.85rem 0.5rem;
    border-bottom: none;
  }

  .nav-link[aria-current="page"] {
    border-bottom: none;
    background-color: rgba(57, 255, 136, 0.08);
    padding-left: 0.9rem;
  }
}

/* =============================
   6. Footer
   ============================= */
.site-footer {
  background-color: var(--deep-space);
  color: var(--text-secondary);
  border-top: 1px solid var(--border-line);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--neon-green);
}

.footer-main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 3.5rem var(--container-pad) 3rem;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 2.5rem;
}

.footer-brand {
  min-width: 0;
}

a.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--heading-family);
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-light);
  text-decoration: none;
  -webkit-text-stroke: 0.75px rgba(57, 255, 136, 0.7);
  text-shadow: 0 0 16px rgba(57, 255, 136, 0.3);
}

a.footer-logo:hover {
  color: var(--text-light);
}

.footer-logo-cn {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--neon-green);
  letter-spacing: 0.14em;
}

.footer-slogan {
  font-family: var(--heading-family);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--neon-green);
  margin-top: 0.45rem;
}

.footer-trust {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.84rem;
  line-height: 1.6;
  max-width: 30em;
}

.footer-nav,
.footer-contact,
.footer-legal {
  min-width: 0;
}

.footer-title {
  font-family: var(--heading-family);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-light);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-line);
  position: relative;
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 30px;
  height: 2px;
  background: var(--neon-green);
}

.footer-nav-list,
.footer-contact-list,
.footer-legal-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-nav-list a,
.footer-legal-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-nav-list a:hover,
.footer-legal-list a:hover {
  color: var(--neon-green);
  padding-left: 4px;
}

.footer-contact-list li {
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.contact-label {
  display: block;
  font-family: var(--heading-family);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--gray-text);
  margin-bottom: 1px;
}

.footer-bottom {
  background-color: var(--dark-background);
  border-top: 1px solid var(--border-line);
  padding: 1.3rem var(--container-pad);
  text-align: center;
}

.footer-copy {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.footer-note {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  color: var(--gray-text);
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 800;
  width: 46px;
  height: 46px;
  display: none;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-line);
  border-radius: 50%;
  background-color: rgba(11, 29, 58, 0.92);
  color: var(--neon-green);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.back-to-top[data-visible] {
  display: flex;
}

.back-to-top:hover {
  border-color: var(--neon-green);
  box-shadow: 0 0 18px rgba(57, 255, 136, 0.35);
  color: var(--neon-green);
}

/* =============================
   7. Buttons
   ============================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.45rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  font-family: var(--heading-family);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color var(--transition-mid), border-color var(--transition-mid), color var(--transition-mid), box-shadow var(--transition-mid), transform var(--transition-mid);
}

.btn-primary {
  background-color: var(--neon-green);
  border-color: var(--neon-green);
  color: var(--dark-background);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--neon-green);
  box-shadow: 0 0 22px rgba(57, 255, 136, 0.4);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--neon-green);
  color: var(--neon-green);
}

.btn-secondary:hover {
  background-color: rgba(57, 255, 136, 0.08);
  box-shadow: 0 0 14px rgba(57, 255, 136, 0.25);
}

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

/* =============================
   8. Typography & Tags
   ============================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--heading-family);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-green);
  margin-bottom: 0.75rem;
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--glow-gradient);
  flex-shrink: 0;
}

.section-title {
  font-family: var(--heading-family);
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.05;
  color: var(--text-light);
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border-line);
  border-radius: 2px;
  font-family: var(--heading-family);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  background-color: rgba(11, 29, 58, 0.6);
  white-space: nowrap;
}

.prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-light);
}

.prose h2 {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  margin-top: 2rem;
}

.prose p {
  margin-bottom: 1.25em;
}

/* =============================
   9. Breadcrumb
   ============================= */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding: 0.9rem 0;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--neon-green);
}

.breadcrumb-sep {
  color: var(--border-line);
}

.breadcrumb [aria-current="page"] {
  color: var(--neon-green);
}

/* =============================
   10. Data Card
   ============================= */
.data-card {
  position: relative;
  padding: 1.5rem 1.5rem 1.25rem;
  background-color: rgba(11, 29, 58, 0.72);
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--glow-gradient);
  opacity: 0.85;
}

.data-card-title {
  font-family: var(--heading-family);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-light);
  margin: 0 0 0.6rem;
}

.data-card-value {
  font-family: var(--heading-family);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.05;
  display: inline-block;
  color: var(--neon-green);
}

@supports (-webkit-background-clip: text) {
  .data-card-value {
    background: var(--glow-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}

.data-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

/* =============================
   11. Photo Frame
   ============================= */
.photo-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--border-line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(57, 255, 136, 0.06), rgba(255, 122, 24, 0.06)),
    var(--dark-background);
}

.photo-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 74, 125, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 125, 0.3) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  z-index: 1;
}

.photo-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, rgba(57, 255, 136, 0.1), transparent 60%);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: inset 0 0 30px rgba(5, 11, 24, 0.5);
  pointer-events: none;
  z-index: 2;
}

.photo-frame img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* =============================
   12. Decorative Components
   ============================= */
.skew-panel {
  position: relative;
  clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%);
}

.data-stream {
  position: relative;
  overflow: hidden;
}

.data-stream::before {
  content: "";
  position: absolute;
  top: 0;
  left: -50%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(57, 255, 136, 0.12), transparent);
  animation: data-stream-slide 3s linear infinite;
  pointer-events: none;
}

@keyframes data-stream-slide {
  from {
    left: -50%;
  }
  to {
    left: 150%;
  }
}

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

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

/* =============================
   14. Responsive
   ============================= */
@media (max-width: 992px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 560px) {
  .footer-main {
    grid-template-columns: 1fr;
    padding: 2.5rem var(--container-pad) 2rem;
  }

  .masthead-meta {
    display: none;
  }
}

/* =============================
   15. Reduced Motion
   ============================= */
@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;
  }

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