:root {
  --green: #1E7352;
  --paper: #F4F0E6;
  --ink: #0E1412;
  --gray: #4A4A4A;
  --orange: #FF6B35;
  --blue: #00C8FF;
  --white: #FFFFFF;
  --grass: #C8E6C9;
  --dark-green: #0A3B22;
  --light-gray: #E0E0E0;

  --font-heading: "Barlow Condensed", "Roboto Condensed", "Arial Narrow", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-number: "JetBrains Mono", "Roboto Mono", "Consolas", monospace;

  --header-height: 72px;
  --container-max: 1280px;
  --shadow-hard: 6px 6px 0px var(--dark-green);
  --shadow-soft: 0 8px 24px rgba(14, 20, 18, 0.15);
  --border-thick: 3px solid var(--ink);
  --border-thin: 1px solid var(--gray);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(3rem, 8vw, 7rem); }
h2 { font-size: clamp(2rem, 5vw, 3.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s, border-color 0.2s;
  border-bottom: 2px solid transparent;
}

a:hover {
  color: var(--green);
  border-bottom-color: currentColor;
}

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

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 1000;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  border-radius: 0 0 4px 4px;
  border-bottom: 2px solid var(--orange);
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--grass);
  z-index: 2000;
  transform-origin: left center;
  transform: scaleX(0);
  pointer-events: none;
}

.progress-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--orange);
  transform-origin: left center;
  transform: scaleX(var(--progress, 0));
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 2px solid transparent;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.site-header.is-scrolled {
  background: var(--paper);
  border-bottom-color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.header-inner {
  display: flex;
  align-items: center;
  min-height: var(--header-height);
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  border: none;
}

.brand:hover {
  border: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--green);
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  border-radius: 4px;
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-number);
  font-size: 0.875rem;
  font-weight: 500;
  border: 2px solid var(--ink);
  border-radius: 4px;
  margin-left: 0.5rem;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  background: transparent;
  border: 2px solid var(--ink);
  border-radius: 4px;
  cursor: pointer;
  margin-left: auto;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

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

.primary-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-list a {
  display: block;
  padding: 0.5rem 0;
  color: var(--ink);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-list a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

.nav-list a[aria-current="page"] {
  color: var(--green);
  border-bottom-color: var(--green);
}

.site-footer {
  background: var(--dark-green);
  color: var(--paper);
  padding-top: 4rem;
  border-top: 4px solid var(--ink);
  margin-top: 4rem;
}

.site-footer .brand-text {
  color: var(--paper);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 2rem;
  padding-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--grass);
  max-width: 32ch;
}

.footer-nav h4,
.footer-legal h4,
.footer-contact h4 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--orange);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.footer-nav a,
.footer-legal a,
.footer-contact a {
  color: var(--paper);
  border-bottom: 1px solid transparent;
}

.footer-nav a:hover,
.footer-legal a:hover,
.footer-contact a:hover {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.footer-nav li,
.footer-legal li,
.footer-contact li {
  margin-bottom: 0.5rem;
}

.footer-contact p {
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--grass);
}

.footer-bottom {
  background: var(--ink);
  padding: 1rem 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-number);
  font-size: 0.75rem;
  color: var(--paper);
}

.data-card {
  background: var(--white);
  border: var(--border-thick);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow-hard);
  transition: transform 0.2s, box-shadow 0.2s;
}

.data-card:hover {
  transform: translate(-2px, -4px);
  box-shadow: 10px 10px 0px var(--dark-green);
}

.panel {
  background: var(--grass);
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 2px solid var(--ink);
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
  background: var(--orange);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}

.btn-primary:hover {
  background: var(--grass);
  color: var(--ink);
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 var(--ink);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
}

.btn-outline:hover {
  background: var(--blue);
  color: var(--ink);
  transform: translateY(-1px);
}

.img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-gray);
  border: var(--border-thick);
  border-radius: 8px;
  min-height: 200px;
  padding: 1rem;
  overflow: hidden;
  position: relative;
}

.img-placeholder::before {
  content: "LM-PIC";
  font-family: var(--font-number);
  color: var(--gray);
  font-size: 0.875rem;
  border: 1px dashed var(--gray);
  padding: 0.5rem 1rem;
}

.img-cover {
  position: relative;
  background: var(--dark-green);
  min-height: 320px;
  display: block;
}

.img-cover::after {
  content: "📸 球场数据流";
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--ink);
}

[data-reveal] {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.3s, transform 0.3s;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateX(0);
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .badge {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: fixed;
    top: calc(var(--header-height) - 1px);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--paper);
    margin-left: 0;
    padding: 2rem 1.5rem;
    border-top: 3px solid var(--ink);
    box-shadow: var(--shadow-soft);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.25s, opacity 0.25s, visibility 0.25s;
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .nav-list a {
    font-size: 1.625rem;
    font-weight: 700;
    padding: 0.75rem 0;
    border-bottom: 2px solid var(--light-gray);
  }

  .nav-list a:hover,
  .nav-list a[aria-current="page"] {
    border-bottom-color: var(--orange);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom-inner {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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

  .site-header {
    background: var(--paper);
  }
}