/* ==========================================================
   火狐体育 Site CSS  /assets/site.css
   竞速数据台 · 轨道导航 · 数据终端视觉
   ========================================================== */

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

:root {
  --color-primary: #FF6B35;
  --color-bg: #1A2A3A;
  --color-bg-deep: #0F1A24;
  --color-bg-surface: #243B4A;
  --color-highlight: #39FF14;
  --color-text: #FFFFFF;
  --color-text-secondary: #A8B8C8;
  --color-border: #2D4659;

  --font-headings: 'Anton', 'Impact', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', 'Menlo', 'Consolas', monospace;

  --header-width: 240px;
  --container-width: 1200px;
  --transition: 0.2s ease-out;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  background-color: var(--color-bg);
  color: var(--color-text);
  margin-left: var(--header-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (min-width: 1024px) {
  html {
    scroll-padding-top: 0;
  }
}

/* 2. Typography
   ========================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--color-text);
  margin-bottom: 0.5em;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.75rem); }
h2 { font-size: clamp(2rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.5rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p { margin-bottom: 1em; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease-out;
}

a:hover {
  text-decoration: underline;
}

strong, b { font-weight: 700; }

ul, ol {
  padding-left: 1.25em;
  margin-bottom: 1em;
}

code, pre, kbd, samp {
  font-family: var(--font-mono);
}

::selection {
  background: var(--color-primary);
  color: #FFFFFF;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg-deep);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* 3. Layout Primitives
   ========================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

#main-content {
  flex: 1;
  width: 100%;
  min-height: 60vh;
}

.section {
  padding: 64px 0;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
  position: relative;
}

.section-head::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -12px;
  width: 64px;
  height: 3px;
  background: var(--color-primary);
  transform: skewX(-30deg);
}

.page-title {
  font-family: var(--font-headings);
  font-size: clamp(2.4rem, 5vw, 3.75rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.page-subtitle {
  color: var(--color-text-secondary);
  font-size: 16px;
  max-width: 640px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-1  { grid-column: span 1;  }
.col-2  { grid-column: span 2;  }
.col-3  { grid-column: span 3;  }
.col-4  { grid-column: span 4;  }
.col-5  { grid-column: span 5;  }
.col-6  { grid-column: span 6;  }
.col-7  { grid-column: span 7;  }
.col-8  { grid-column: span 8;  }
.col-9  { grid-column: span 9;  }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* 4. Buttons
   ========================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border: none;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease-out, box-shadow 0.2s ease-out,
              background-color 0.2s ease-out, color 0.2s ease-out,
              border-color 0.2s ease-out;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  transform: skewX(-6deg);
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
  transform: skewX(-6deg) translateY(-2px);
  background-color: var(--color-primary);
  color: #FFFFFF;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.5);
}

.btn-primary:active {
  transform: skewX(-6deg) translateY(0);
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

/* 5. Image frame
   ========================================================== */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 8px;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
}

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

/* 6. Skip link
   ========================================================== */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 999;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
  transition: top 0.2s ease-out;
}

.skip-link:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  color: #FFFFFF;
}

/* 7. Header sidebar
   ========================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--header-width);
  height: 100vh;
  background:
    linear-gradient(160deg, rgba(255, 107, 53, 0.05) 0%, transparent 40%),
    linear-gradient(0deg, rgba(57, 255, 20, 0.03) 0%, transparent 25%),
    var(--color-bg-deep);
  border-right: 1px solid var(--color-border);
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.header-topbar {
  padding: 24px 20px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-text);
  text-decoration: none;
}

.brand-mark {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #FF6B35 0%, #D9481F 100%);
  border-radius: 10px;
  font-family: var(--font-headings);
  font-size: 26px;
  font-weight: 700;
  color: #FFFFFF;
  transform: rotate(-8deg);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

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

.brand-name {
  font-family: var(--font-headings);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.site-nav {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding-top: 28px;
}

.nav-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding: 0 36px 12px;
  opacity: 0.6;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: auto;
  margin-bottom: auto;
  padding: 0;
  list-style: none;
  position: relative;
}

.nav-list::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--color-border) 0 5px,
    transparent 5px 12px
  );
}

.nav-item {
  position: relative;
  line-height: 1.3;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px 13px 48px;
  color: var(--color-text-secondary);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 0.2s ease-out, background-color 0.2s ease-out,
              padding-left 0.2s ease-out;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  box-shadow: 0 0 0 3px rgba(45, 70, 89, 0.2);
  transition: background-color 0.2s ease-out, box-shadow 0.2s ease-out;
  z-index: 1;
}

.nav-link:hover {
  color: var(--color-text);
  background-color: rgba(255, 255, 255, 0.03);
  padding-left: 52px;
  text-decoration: none;
}

.nav-link:hover::before {
  background: var(--color-primary);
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.6);
}

.nav-link[aria-current="page"] {
  color: var(--color-text);
  background-color: rgba(255, 107, 53, 0.08);
}

.nav-link[aria-current="page"]::before {
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.25),
              0 0 12px rgba(255, 107, 53, 0.6);
}

.header-cta {
  margin: 16px 20px;
  justify-content: center;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 20px 20px;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.status-dot {
  flex: 0 0 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-highlight);
  box-shadow: 0 0 8px var(--color-highlight);
  animation: status-pulse 2s ease-in-out infinite;
}

.status-text {
  font-size: 12px;
  letter-spacing: 0.02em;
}

@keyframes status-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.4;
    transform: scale(0.8);
  }
}

/* 8. Nav toggle (mobile only)
   ========================================================== */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: background-color 0.2s ease-out;
}

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

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

.nav-toggle:hover .nav-toggle-bar {
  background: var(--color-primary);
}

/* 9. Footer
   ========================================================== */
.site-footer {
  background:
    radial-gradient(ellipse at 15% 0%, rgba(255, 107, 53, 0.08) 0%, transparent 45%),
    var(--color-bg-deep);
  border-top: 1px solid var(--color-border);
}

.footer-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}

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

.footer-about {
  color: var(--color-text-secondary);
  font-size: 15px;
  max-width: 280px;
}

.footer-trust {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 20px;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.trust-badge {
  flex: 0 0 auto;
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid rgba(57, 255, 20, 0.5);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-highlight);
  background: rgba(57, 255, 20, 0.05);
}

.footer-service {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  opacity: 0.7;
}

.footer-col-title {
  font-family: var(--font-headings);
  font-size: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 10px;
  position: relative;
  color: var(--color-text);
}

.footer-col-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--color-primary);
  transform: skewX(-30deg);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  display: inline-block;
  color: var(--color-text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease-out, padding-left 0.2s ease-out;
}

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

.footer-meta {
  border-top: 1px solid var(--color-border);
  background: rgba(11, 17, 24, 0.8);
  padding: 18px 0;
}

.footer-meta-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer-meta-brand {
  margin: 0;
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: 0.1em;
}

.footer-meta-address {
  margin: 0;
  font-size: 13px;
}

.footer-meta-contact {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-meta-contact a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-meta-contact a:hover {
  color: var(--color-primary);
}

.footer-meta-copyright {
  margin: 0;
}

.footer-meta-icp {
  margin: 0;
}

/* 10. Scroll progress
    ========================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--header-width);
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-highlight));
  z-index: 1000;
  pointer-events: none;
  transition: width 0.06s linear;
}

/* 11. Responsive
    ========================================================== */
@media (max-width: 1023px) {
  body {
    margin-left: 0;
  }

  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    height: 64px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-deep);
  }

  .header-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 8px 16px;
  }

  .site-nav {
    position: fixed;
    left: -320px;
    top: 64px;
    width: 300px;
    height: calc(100vh - 64px);
    overflow-y: auto;
    padding: 24px 0 32px;
    background:
      linear-gradient(160deg, rgba(255, 107, 53, 0.05) 0%, transparent 40%),
      var(--color-bg-deep);
    border-right: 1px solid var(--color-border);
    border-top: 1px solid var(--color-border);
    z-index: 200;
    box-shadow: none;
    transition: left 0.3s ease-out;
  }

  .site-nav[data-open] {
    left: 0;
    box-shadow: 8px 0 24px rgba(0, 0, 0, 0.5);
  }

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

  .nav-label {
    padding: 0 28px 10px;
  }

  .nav-list {
    margin-top: 0;
    margin-bottom: 0;
    padding: 0 0 16px;
  }

  .nav-list::before {
    left: 23px;
  }

  .nav-link {
    padding: 13px 16px 13px 44px;
  }

  .nav-link::before {
    left: 20px;
  }

  .nav-link:hover {
    padding-left: 48px;
  }

  .header-cta {
    margin: 16px;
  }

  .header-status {
    margin: 0 16px 16px;
  }

  .footer-shell {
    grid-template-columns: 1fr 1fr;
    padding: 40px 24px 32px;
    gap: 32px;
  }

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

  .scroll-progress {
    left: 0;
  }
}

@media (max-width: 639px) {
  .section {
    padding: 40px 0;
  }

  .grid {
    gap: 16px;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-meta-shell {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

/* 12. Focus & reduced motion
    ========================================================== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .status-dot {
    animation: none;
  }

  .scroll-progress {
    transition: none;
  }
}