/* =========================================================
   火博体育 / truth-huobo.com.cn
   共享样式 /assets/site.css
   概念：数据赛场 · 堆叠画板 · 坐标索引
   ========================================================= */

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

/* ---------- 2. CSS Variables ---------- */
:root {
  --c-deep: #07111F;
  --c-panel: #0E1E2F;
  --c-raised: #152B3D;
  --c-mist: #A8C1D4;
  --c-ink: #F2F7FA;
  --c-accent: #FF6B2C;
  --c-accent-soft: #FFA26B;
  --c-line: #7FB8D4;
  --c-line-soft: rgba(127, 184, 212, 0.2);
  --c-glow: rgba(255, 107, 44, 0.15);
  --c-grid: rgba(127, 184, 212, 0.05);

  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Bebas Neue", "DIN Alternate", "Impact", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", Consolas, monospace;

  --container: 1200px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --transition: 200ms ease;
}

/* ---------- 3. Base ---------- */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-ink);
  background-color: var(--c-deep);
  background-image:
    linear-gradient(var(--c-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid) 1px, transparent 1px),
    radial-gradient(ellipse at 80% -10%, rgba(127, 184, 212, 0.1), transparent 50%),
    radial-gradient(ellipse at 10% 110%, var(--c-glow), transparent 45%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  background-repeat: repeat, repeat, no-repeat, no-repeat;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
  min-height: calc(100vh - 200px);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--c-ink);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
h4 { font-size: 1.05rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--c-line);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--c-accent-soft);
}

strong, b { font-weight: 600; }

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

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.prose {
  max-width: 720px;
}

.prose h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.prose h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose p {
  margin-bottom: 1.25rem;
  color: var(--c-mist);
}

.prose ul,
.prose ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--c-mist);
}

.prose li {
  margin-bottom: 0.5rem;
}

/* ---------- 5. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 999;
  padding: 12px 24px;
  background: var(--c-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  transition: top 200ms ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* ---------- 6. Scroll Progress ---------- */
.telemetry-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 300;
  pointer-events: none;
}

.telemetry-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-soft));
  box-shadow: 0 0 12px var(--c-accent);
  transition: width 120ms linear;
}

/* ---------- 7. Header ---------- */
.site-header {
  position: relative;
  z-index: 50;
  background: var(--c-panel);
  border-bottom: 1px solid var(--c-line-soft);
}

.header-upper {
  background: var(--c-deep);
  border-bottom: 1px solid var(--c-line-soft);
}

.header-upper-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
}

.header-statement {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-statement b {
  color: var(--c-accent-soft);
  font-weight: 700;
}

.header-statement-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 10px var(--c-accent);
  animation: dot-pulse 2s ease infinite;
}

@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.header-coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--c-line);
  flex-shrink: 0;
}

.header-lower {
  background: var(--c-panel);
}

.header-lower-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

/* ---------- 8. Brand ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-soft));
  color: var(--c-deep);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.03em;
  box-shadow: 0 4px 16px var(--c-glow);
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--c-ink);
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-accent-soft);
  font-style: normal;
  text-transform: uppercase;
}

/* ---------- 9. Navigation ---------- */
[data-nav] {
  display: flex;
  align-items: center;
  gap: 4px;
}

[data-nav] a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-mist);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

[data-nav] a:hover {
  background: var(--c-raised);
  color: var(--c-ink);
}

[data-nav] a[aria-current="page"] {
  background: var(--c-glow);
  color: var(--c-accent);
  font-weight: 600;
}

[data-nav] a[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px var(--c-accent);
}

/* ---------- 10. Nav Toggle (mobile) ---------- */
[data-nav-toggle] {
  display: none;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color var(--transition), background var(--transition);
}

[data-nav-toggle]:hover {
  border-color: var(--c-line);
  background: var(--c-panel);
}

.nav-toggle-lines {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-ink);
  transition: transform 250ms cubic-bezier(0.4, 0, 0.2, 1), opacity 250ms ease;
}

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

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

[data-nav-toggle][aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 11. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--c-panel);
  border-top: 1px solid var(--c-line-soft);
  overflow: hidden;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--c-glow), transparent 70%);
  pointer-events: none;
}

.footer-main {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 48px;
  padding: 64px 24px 48px;
  max-width: var(--container);
  margin-inline: auto;
  position: relative;
}

.footer-block-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--c-accent-soft);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--c-mist);
  font-size: 14px;
  transition: color var(--transition), padding-left var(--transition);
}

.footer-links a:hover {
  color: var(--c-accent-soft);
  padding-left: 4px;
}

.footer-trust {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-mist);
  border-left: 2px solid var(--c-accent);
  padding-left: 14px;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 14px;
  color: var(--c-mist);
}

.footer-contact-list li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  word-break: break-all;
}

.footer-contact-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent);
  flex-shrink: 0;
  min-width: 36px;
}

.footer-contact-note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-mist);
  border-left: 2px solid var(--c-line);
  padding-left: 14px;
}

.footer-bottom {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding: 20px 24px;
  max-width: var(--container);
  margin-inline: auto;
  border-top: 1px solid var(--c-line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-mist);
}

.footer-sigil {
  letter-spacing: 0.2em;
  color: var(--c-line);
}

/* ---------- 12. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-ink);
}

.btn-primary:hover {
  background: var(--c-accent-soft);
  color: var(--c-ink);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--c-glow);
}

.btn-ghost {
  background: transparent;
  border-color: var(--c-line);
  color: var(--c-mist);
}

.btn-ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-ink);
  background: var(--c-glow);
}

/* ---------- 13. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 16px 0 32px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-mist);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--c-line);
  opacity: 0.5;
}

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

.breadcrumb a:hover {
  color: var(--c-accent-soft);
}

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

/* ---------- 14. Page Heading ---------- */
.page-heading {
  padding: 40px 0 24px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-heading h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1.1;
}

.page-leading {
  margin-top: 12px;
  font-size: 1.05rem;
  color: var(--c-mist);
  max-width: 680px;
}

/* ---------- 15. Section Panel ---------- */
.section-panel {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  padding: clamp(28px, 4vw, 56px);
  margin-bottom: 32px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.section-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--c-accent) 0%, var(--c-accent-soft) 40%, transparent 100%);
}

.panel-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-accent);
  margin-bottom: 8px;
  text-transform: uppercase;
}

/* ---------- 16. Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.card {
  position: relative;
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: var(--c-line);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

/* ---------- 17. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  background: var(--c-glow);
  color: var(--c-accent);
  border: 1px solid rgba(255, 107, 44, 0.3);
}

.tag-outline {
  background: transparent;
  border-color: var(--c-line-soft);
  color: var(--c-mist);
}

/* ---------- 18. Filter System ---------- */
[data-filter-group] {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

[data-filter-button] {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-mist);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

[data-filter-button]:hover {
  border-color: var(--c-line);
  color: var(--c-ink);
}

[data-filter-button].is-active,
[data-filter-button][aria-pressed="true"] {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-ink);
  font-weight: 600;
  box-shadow: 0 4px 14px var(--c-glow);
}

[data-filter-target][hidden] {
  display: none !important;
}

[data-filter-target].is-filter-show {
  animation: filter-in 300ms ease both;
}

@keyframes filter-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 19. Media Frame ---------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
}

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

.media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 40px 16px 12px;
  background: linear-gradient(180deg, transparent, rgba(7, 17, 31, 0.8));
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-mist);
}

/* ---------- 20. Legend ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  padding: 16px 20px;
  background: var(--c-panel);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--c-mist);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  flex-shrink: 0;
}

.legend-dot.dot-line {
  background: var(--c-line);
}

/* ---------- 21. Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 22. Utilities ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--c-accent);
}

/* ---------- 23. Tablet ---------- */
@media (max-width: 960px) {
  [data-nav] a {
    padding: 8px 12px;
    font-size: 13px;
  }

  .brand-name {
    font-size: 19px;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    padding: 48px 24px 36px;
  }
}

/* ---------- 24. Mobile ---------- */
@media (max-width: 720px) {
  .container-outer {
    padding-inline: 16px;
  }

  .header-upper-inner {
    min-height: 36px;
  }

  .header-statement {
    font-size: 11px;
  }

  .header-coord {
    display: none;
  }

  .header-lower-inner {
    min-height: 64px;
  }

  [data-nav-toggle] {
    display: flex;
  }

  [data-nav] {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    max-height: 0;
    overflow: hidden;
    padding: 0 16px;
    background: var(--c-panel);
    border-bottom: 1px solid var(--c-line-soft);
    visibility: hidden;
    opacity: 0;
    transition: max-height 300ms ease, opacity 200ms ease, padding 200ms ease, visibility 0s linear 300ms;
  }

  [data-nav][data-open] {
    max-height: 480px;
    padding: 12px 16px 16px;
    visibility: visible;
    opacity: 1;
    transition: max-height 300ms ease, opacity 200ms ease, padding 200ms ease;
  }

  [data-nav] a {
    display: block;
    padding: 13px 14px;
    border-radius: var(--radius-md);
    border-left: 2px solid transparent;
  }

  [data-nav] a:hover {
    background: var(--c-raised);
  }

  [data-nav] a[aria-current="page"] {
    border-left-color: var(--c-accent);
    background: var(--c-glow);
  }

  [data-nav] a[aria-current="page"]::after {
    display: none;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 32px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
  }

  .footer-sigil {
    font-size: 11px;
  }

  .section-panel {
    padding: 24px 18px;
    border-radius: 16px;
  }
}

/* ---------- 25. Reduced Motion & Focus ---------- */
@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;
  }
}