/* ===== Reset & Variables ===== */
:root {
  --color-bg-main: #0B1D3A;
  --color-bg-secondary: #132B54;
  --color-bg-tertiary: #1C3D6E;
  --color-accent: #00FF87;
  --color-gold: #FFC72C;
  --color-text-main: #FFFFFF;
  --color-text-muted: #B0BEC5;
  --color-text-index: #78909C;
  --color-bg-footer: #050A14;
  --color-border: rgba(255, 255, 255, 0.08);
  --font-sans: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
  --spacing-xxl: 96px;
  --container-max: 1280px;
  --header-h: 80px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-main);
  background-color: var(--color-bg-main);
  background-image:
    linear-gradient(rgba(0, 255, 135, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 135, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

ul, ol {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.mono-label, .brand-badge, .stat-value, .index-tag {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ===== Container ===== */
.site-main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--color-accent);
  color: var(--color-bg-main);
  font-weight: 700;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 0 0 8px 0;
}

.skip-link:focus-visible {
  left: 0;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, var(--color-bg-main) 0%, var(--color-bg-secondary) 100%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-top {
  height: var(--header-h);
}

.header-bottom {
  border-top: 1px solid var(--color-border);
  min-height: 48px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-bg-tertiary);
  border: 2px solid var(--color-gold);
  color: var(--color-gold);
  font-weight: 700;
  font-size: 12px;
  transform: skewX(-6deg);
}

.brand-badge::first-letter {
  color: var(--color-accent);
}

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

.brand-name {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.4em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg-main);
}

.btn-primary:hover {
  background: var(--color-text-main);
  color: var(--color-bg-main);
  box-shadow: 0 0 20px rgba(0, 255, 135, 0.4);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

/* ===== Nav Toggle ===== */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  padding: 8px 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-main);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

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

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

/* ===== Navigation ===== */
.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  display: inline-block;
  padding: 12px 4px;
  font-weight: 700;
  font-size: 15px;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-main);
  border-bottom-color: var(--color-accent);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  box-shadow: inset 0 -1px 0 var(--color-accent);
}

/* ===== Footer ===== */
.site-footer {
  margin-top: var(--spacing-xxl);
  background: linear-gradient(180deg, var(--color-bg-footer) 0%, var(--color-bg-main) 100%);
  border-top: 2px solid var(--color-bg-tertiary);
  color: var(--color-text-muted);
}

.footer-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-xl);
}

.footer-brand {
  font-size: 22px;
  font-weight: 900;
  color: var(--color-text-main);
  letter-spacing: 0.02em;
  display: inline-block;
  margin-bottom: var(--spacing-sm);
}

.footer-brand:hover {
  color: var(--color-accent);
}

.footer-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  max-width: 360px;
}

.footer-trust {
  font-size: 12px;
  color: var(--color-text-index);
  border-left: 2px solid var(--color-gold);
  padding-left: var(--spacing-sm);
  max-width: 360px;
}

.footer-heading {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: var(--spacing-xs);
}

.footer-heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.footer-links li, .footer-contact li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a, .footer-contact a {
  color: var(--color-text-muted);
  font-size: 14px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

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

.footer-contact li {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
  font-size: 14px;
}

.footer-contact .mono-label {
  color: var(--color-gold);
  font-size: 12px;
  min-width: 32px;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  font-size: 13px;
  color: var(--color-text-index);
}

/* ===== Common Panels & Components ===== */
.panel {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  border-radius: 0;
}

.panel-cut {
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  background: var(--color-bg-secondary);
  border: none;
  padding: var(--spacing-lg);
}

.panel-cut + .panel-cut {
  margin-top: var(--spacing-md);
}

.index-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-text-index);
  background: var(--color-bg-tertiary);
  padding: 2px 8px;
  margin-bottom: var(--spacing-sm);
  border-left: 2px solid var(--color-accent);
}

/* ===== Image Containers ===== */
.img-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.img-container::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 70% 20%, rgba(0, 255, 135, 0.15), transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(255, 199, 44, 0.15), transparent 40%);
  opacity: 0.8;
}

.img-container::after {
  content: 'SPORT / DATA';
  position: absolute;
  bottom: var(--spacing-sm);
  left: var(--spacing-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-main);
  letter-spacing: 0.2em;
  background: rgba(11, 29, 58, 0.8);
  padding: 4px 8px;
  border-left: 2px solid var(--color-gold);
}

.img-rise {
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.img-rise:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

/* ===== Data Blocks ===== */
.stat-block {
  background: var(--color-bg-secondary);
  border-left: 3px solid var(--color-accent);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-block:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 255, 135, 0.15);
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

.stat-block.gold {
  border-left-color: var(--color-gold);
}

.stat-block.gold .stat-value {
  color: var(--color-gold);
}

/* ===== Scroll Progress & Top Button ===== */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold));
  z-index: 9999;
  transition: width 0.1s linear;
}

.scroll-top-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 24px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  z-index: 998;
}

.scroll-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top-btn:hover {
  background: var(--color-accent);
  color: var(--color-bg-main);
  box-shadow: 0 0 20px rgba(0, 255, 135, 0.5);
}

.scroll-top-btn[aria-hidden="true"] {
  pointer-events: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .header-top {
    height: 64px;
  }

  .brand-badge {
    width: 40px;
    height: 40px;
    font-size: 10px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-tagline {
    font-size: 10px;
    letter-spacing: 0.2em;
  }

  .quick-index-btn {
    display: inline-flex;
  }

  .nav-toggle {
    display: flex;
  }

  .header-bottom {
    display: none;
    border-top: 1px solid var(--color-border);
    width: 100%;
  }

  .header-bottom[data-open] {
    display: block;
  }

  .main-nav {
    width: 100%;
    justify-content: flex-start;
    padding: var(--spacing-sm) 0;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: 14px var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    border-left: 2px solid transparent;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    border-left-color: var(--color-accent);
    background: rgba(0, 255, 135, 0.05);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    padding: var(--spacing-lg) 0;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .scroll-top-btn {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 16px;
  }

  .brand-tagline {
    display: none;
  }

  .header-actions .btn-sm {
    padding: 6px 10px;
    font-size: 12px;
  }

  .header-top {
    gap: var(--spacing-sm);
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

  .img-rise:hover,
  .stat-block:hover,
  .btn:hover,
  .nav-link:hover {
    transform: none;
  }
}