/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html, body, div, span, h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, address, cite, code, del, em, img, ins, kbd, q, samp,
small, strong, sub, sup, var, b, u, i, dl, dt, dd, ol, ul, li,
fieldset, form, label, legend, table, caption, tbody, tfoot, thead,
tr, th, td, article, aside, canvas, details, figcaption, figure,
footer, header, hgroup, menu, nav, section, summary, main {
  margin: 0;
  padding: 0;
  border: 0;
}
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
address { font-style: normal; }

/* ===== CSS Variables ===== */
:root {
  --color-bg: #0A1F44;
  --color-bg-deep: #071634;
  --color-card: #13264D;
  --color-card-raised: #1A3163;
  --color-accent: #39FF14;
  --color-accent-secondary: #FF6B00;
  --color-text: #F5F7FA;
  --color-muted: #AAB6C9;
  --color-line: rgba(255,255,255,0.2);
  --color-line-strong: rgba(255,255,255,0.35);
  --color-warning: #FFD400;
  --color-success: #00C48C;
  --color-danger: #FF4D4F;

  --font-display-cn: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display-en: "Anton", "Impact", "Haettenschweiler", "Arial Narrow", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Consolas", "Menlo", monospace;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1280px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-lg: 1.0625rem;
  --text-xl: 1.375rem;
  --text-2xl: 1.75rem;
  --text-3xl: 2.25rem;
  --text-4xl: 3rem;
  --text-hero: clamp(2.5rem, 6vw, 5rem);
}

/* ===== Base Typography ===== */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display-cn);
  font-weight: 200;
  color: var(--color-text);
  line-height: 1.25;
}
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--color-text); }
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}
::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ===== Layout Helpers ===== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.site-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-5);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

/* ===== Section ===== */
.section { padding-block: var(--space-8); }
.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
}
.section-title {
  font-family: var(--font-display-cn);
  font-weight: 200;
  font-size: var(--text-2xl);
  letter-spacing: 0.02em;
}
.section-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  padding: 4px 10px;
  letter-spacing: 0.1em;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 24px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-accent {
  background: var(--color-accent);
  color: var(--color-bg);
}
.btn-accent:hover {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-line-strong);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-sm {
  padding: 8px 16px;
  font-size: var(--text-xs);
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border: 1px solid var(--color-line-strong);
  color: var(--color-muted);
}
.badge-accent {
  color: var(--color-bg);
  background: var(--color-accent);
  border-color: var(--color-accent);
}
.badge-orange {
  color: var(--color-bg);
  background: var(--color-accent-secondary);
  border-color: var(--color-accent-secondary);
}

/* ===== Cards ===== */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: var(--space-5);
}
.card-accent-top { border-top: 3px solid var(--color-accent); }
.card-orange-top { border-top: 3px solid var(--color-accent-secondary); }
.card-title {
  font-family: var(--font-display-cn);
  font-weight: 200;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

/* ===== Data Table ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-line);
}
.data-table td {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-line);
}

/* ===== Display Number ===== */
.display-number {
  font-family: var(--font-display-en);
  font-size: var(--text-hero);
  line-height: 0.9;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

/* ===== Image Frame ===== */
.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  aspect-ratio: 16 / 9;
}
.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: repeating-linear-gradient(
    0deg,
    transparent 0px,
    transparent 4px,
    rgba(255, 255, 255, 0.02) 4px,
    rgba(255, 255, 255, 0.02) 5px
  );
  pointer-events: none;
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.image-frame.ratio-4-3 { aspect-ratio: 4 / 3; }
.image-frame.ratio-1-1 { aspect-ratio: 1 / 1; }
.image-frame.ratio-21-9 { aspect-ratio: 21 / 9; }

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  font-size: var(--text-sm);
  color: var(--color-muted);
}
.breadcrumbs a {
  color: var(--color-muted);
}
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs-sep {
  color: var(--color-line-strong);
  font-size: var(--text-xs);
}
.breadcrumbs-current { color: var(--color-text); }

/* ===== Skip Link ===== */
.skip-link {
  position: fixed;
  left: -9999px;
  top: -9999px;
  z-index: 9999;
  background: var(--color-accent);
  color: var(--color-bg);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 12px 20px;
  text-decoration: none;
}
.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

/* ===== Scroll Progress ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1000;
  background: var(--color-accent);
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
}

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-5) var(--space-4);
}
.masthead-brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  text-decoration: none;
  line-height: 1;
}
.brand-kaiyun {
  font-family: var(--font-display-en);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--color-text);
  line-height: 1;
}
.brand-cn {
  font-family: var(--font-display-cn);
  font-weight: 200;
  font-size: clamp(1.0625rem, 2vw, 1.5rem);
  color: var(--color-text);
  letter-spacing: 0.05em;
}
.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 2px 6px;
  margin-left: var(--space-1);
  white-space: nowrap;
}
.masthead-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.masthead-ticker {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: var(--space-2) var(--space-4);
}
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: live-pulse 1.6s ease-in-out infinite;
}
.ticker-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
}
.ticker-label {
  font-size: var(--text-xs);
  color: var(--color-muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
}
@keyframes live-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.6);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 6px rgba(57, 255, 20, 0);
    opacity: 0.8;
  }
}

/* ===== Nav Toggle ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}
.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}
.nav-toggle-text {
  font-size: 0.5625rem;
  color: var(--color-muted);
  letter-spacing: 0.1em;
}

/* ===== Nav ===== */
.site-nav {
  border-top: 1px solid var(--color-line);
}
.nav-list {
  display: flex;
  margin: 0;
  padding: 0;
}
.nav-item {
  margin: 0;
}
.nav-item:first-child .nav-link {
  border-left: 1px solid var(--color-line);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-muted);
  text-decoration: none;
  border-right: 1px solid var(--color-line);
  border-bottom: 2px solid transparent;
  letter-spacing: 0.06em;
  transition: color 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-line-strong);
  letter-spacing: 0.05em;
}
.nav-link:hover {
  color: var(--color-accent);
  background: rgba(57, 255, 20, 0.04);
}
.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ===== Header Scanline ===== */
.header-scanline {
  position: relative;
  height: 2px;
  background: var(--color-line);
  overflow: hidden;
}
.header-scanline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 45%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-accent-secondary), transparent);
  animation: scan-sweep 3.2s ease-in-out infinite;
}
@keyframes scan-sweep {
  0% { transform: translateX(-110%); }
  55%, 100% { transform: translateX(320%); }
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-line);
  margin-top: var(--space-8);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-secondary) 60%, transparent 100%);
  opacity: 0.7;
}
.footer-inner {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: var(--space-8) var(--space-5) var(--space-5);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-6);
  padding-bottom: var(--space-7);
  border-bottom: 1px solid var(--color-line);
  margin-bottom: var(--space-5);
}
.footer-brand {
  grid-column: span 5;
}
.footer-nav {
  grid-column: span 3;
}
.footer-contact {
  grid-column: span 4;
}
.footer-brand-name {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.footer-brand-kaiyun {
  font-family: var(--font-display-en);
  font-size: var(--text-2xl);
  color: var(--color-text);
  line-height: 1;
}
.footer-brand-cn {
  font-family: var(--font-display-cn);
  font-weight: 200;
  font-size: var(--text-lg);
  color: var(--color-text);
}
.footer-trust {
  font-size: var(--text-sm);
  color: var(--color-accent);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-2);
}
.footer-note {
  font-size: var(--text-sm);
  color: var(--color-muted);
  max-width: 32em;
}
.footer-heading {
  font-family: var(--font-display-cn);
  font-weight: 300;
  font-size: var(--text-sm);
  letter-spacing: 0.15em;
  color: var(--color-text);
  text-transform: uppercase;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-line);
}
.footer-nav-list li {
  margin-bottom: var(--space-2);
}
.footer-nav-list a {
  color: var(--color-muted);
  font-size: var(--text-sm);
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-nav-list a:hover {
  color: var(--color-accent);
  padding-left: var(--space-1);
}
.footer-contact-list {
  margin: 0;
}
.footer-contact-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-3);
  align-items: baseline;
  margin-bottom: var(--space-3);
}
.footer-contact-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-muted);
}
.footer-contact-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text);
  word-break: break-all;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-copyright {
  font-size: var(--text-sm);
  color: var(--color-muted);
}
.footer-legal-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-legal-list a {
  font-size: var(--text-sm);
  color: var(--color-muted);
}
.footer-legal-list a:hover {
  color: var(--color-accent);
}
.footer-icp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  color: var(--color-muted);
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  .footer-grid {
    gap: var(--space-4);
  }
  .footer-brand { grid-column: span 12; }
  .footer-nav { grid-column: span 6; }
  .footer-contact { grid-column: span 6; }
}

@media (max-width: 900px) {
  .site-grid { gap: var(--space-4); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 {
    grid-column: span 12;
  }
  .container { padding-inline: var(--space-4); }

  /* Header mobile */
  .masthead {
    padding-block: var(--space-4) var(--space-3);
  }
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    display: none;
    border-top: 1px solid var(--color-line);
  }
  .site-nav[data-open] {
    display: block;
  }
  .nav-list {
    flex-direction: column;
  }
  .nav-item:first-child .nav-link {
    border-left: none;
  }
  .nav-link {
    border-right: none;
    border-bottom: 1px solid var(--color-line);
    border-left: none;
    padding: var(--space-3) var(--space-4);
  }
  .nav-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left: 3px solid var(--color-accent);
  }
}

@media (max-width: 640px) {
  .section { padding-block: var(--space-7); }
  .masthead-brand {
    flex-wrap: wrap;
  }
  .masthead-ticker {
    padding: var(--space-1) var(--space-3);
  }
  .ticker-value {
    font-size: var(--text-lg);
  }
  .ticker-label {
    display: none;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .brand-subtitle {
    display: none;
  }
  .nav-toggle-text {
    display: none;
  }
  .nav-toggle {
    padding: var(--space-2);
    min-width: 40px;
    min-height: 40px;
  }
  .masthead-ticker {
    padding: var(--space-1) var(--space-2);
  }
  .ticker-value {
    font-size: var(--text-base);
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
  .footer-brand,
  .footer-nav,
  .footer-contact {
    grid-column: span 1;
  }
  .footer-inner {
    padding-top: var(--space-7);
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .live-dot,
  .header-scanline::before {
    animation: none;
  }
  .nav-toggle-bar {
    transition: none;
  }
}