/* ========================================
   Site Core CSS – 万搏体育站
   Version: 1.0
   Note: 所有共享组件样式定义于此
   ======================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}
a:hover {
  color: var(--accent-light);
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- CSS Variables --- */
:root {
  --primary: #1A3B5C;
  --primary-light: #26547c;
  --accent: #FF6B35;
  --accent-light: #ff8f5e;
  --accent-gradient: linear-gradient(135deg, #FF6B35, #FF8F00);
  --bg-dark: #0D1B2A;
  --bg-card: #1B2838;
  --surface-light: #F0F2F5;
  --text-primary: #FFFFFF;
  --text-secondary: #B0BEC5;
  --text-muted: #78909C;
  --border-light: rgba(255,255,255,0.08);
  --border-accent: rgba(255,107,53,0.4);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --font-heading: 'Bebas Neue', 'Arial Narrow', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --content-max: 1280px;
  --header-height: 80px;
  --ticker-height: 40px;
  --z-nav: 1000;
  --z-toggle: 1001;
  --z-progress: 2000;
  --z-backtop: 3000;
  --transition-fast: 0.2s ease;
  --transition-med: 0.35s ease;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.75rem); }

.body-text {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.small-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.data-number {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--accent);
}

.text-accent { color: var(--accent); }

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

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

.section-padding {
  padding-top: 4rem;
  padding-bottom: 4rem;
}
@media (max-width: 768px) {
  .section-padding {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }
  .content-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* --- Focus Ring --- */
.focus-ring:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--accent);
  color: var(--bg-dark);
  padding: 0.5rem 1rem;
  z-index: 10000;
  font-weight: 600;
  font-size: 0.875rem;
  transition: top 0.25s ease;
}
.skip-link:focus {
  top: 0;
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--primary);
  box-shadow: var(--shadow-sm);
  z-index: var(--z-nav);
  display: flex;
  flex-direction: column;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding-top: 0;
  padding-bottom: 0;
}

.header-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-name {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--text-primary);
  letter-spacing: 0.04em;
}
.brand-sub {
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* --- Navigation --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 0.25rem;
  transition: border-color var(--transition-fast);
}
.nav-toggle:focus-visible {
  border-color: var(--accent);
}
.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  margin: 3px 0;
  transition: transform var(--transition-med), opacity var(--transition-med);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}
.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: rotate(-45deg) translate(4px, -4px);
}

.header-nav .nav-list {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.header-nav a {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 0;
  position: relative;
  transition: color var(--transition-fast);
}
.header-nav a:hover {
  color: var(--accent);
}
.header-nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

/* --- Rank Ticker --- */
.rank-ticker {
  width: 100%;
  overflow: hidden;
  background: var(--bg-dark);
  border-top: 1px solid var(--border-accent);
  border-bottom: 1px solid var(--border-accent);
  height: var(--ticker-height);
  display: flex;
  align-items: center;
}
.ticker-track {
  display: flex;
  white-space: nowrap;
  animation: ticker-scroll 20s linear infinite;
}
.ticker-item {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--accent);
  padding: 0 2rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .ticker-track {
    animation: none;
  }
}

/* --- Mobile Navigation --- */
@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }
  .header-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--primary);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-med), opacity var(--transition-med), visibility var(--transition-med);
    box-shadow: var(--shadow-md);
    z-index: var(--z-nav);
  }
  .header-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .header-nav .nav-list {
    flex-direction: column;
    padding: 1.5rem 0;
    gap: 0.5rem;
  }
  .header-nav a {
    display: block;
    padding: 0.75rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border-light);
  }
  .header-nav a[aria-current="page"] {
    border-bottom: 2px solid var(--accent);
  }
}

/* --- Footer --- */
.site-footer {
  background: var(--primary);
  color: var(--text-secondary);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
  border-top: 2px solid var(--accent);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.footer-brand {
  text-align: center;
}
.footer-brand .brand-name {
  font-size: 2rem;
}
.footer-brand .brand-sub {
  font-size: 0.85rem;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.footer-links a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.footer-contact {
  text-align: center;
  font-size: 0.875rem;
  line-height: 1.8;
}
.footer-contact a {
  color: var(--accent);
}
.footer-icp {
  text-align: center;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.footer-note {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}
.footer-copy {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .footer-links {
    gap: 1rem;
  }
  .footer-contact {
    font-size: 0.8rem;
  }
}

/* --- Shared Components --- */

/* Buttons */
.btn-primary,
.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 4px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.btn-primary {
  background: var(--primary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}
.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn-accent {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
}
.btn-accent:hover {
  transform: scale(1.02);
  box-shadow: 0 0 20px rgba(255,107,53,0.4);
}
.btn-primary:focus-visible,
.btn-accent:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Pulse dot (for real-time indicator) */
.pulse-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 1.5s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.3); }
}
@media (prefers-reduced-motion: reduce) {
  .pulse-dot {
    animation: none;
  }
}

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(255,107,53,0.2);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.breadcrumb a {
  color: var(--text-secondary);
}
.breadcrumb a:hover {
  color: var(--accent);
}
.breadcrumb .separator {
  color: var(--text-muted);
}

/* Section title with optional label */
.section-title {
  margin-bottom: 1.5rem;
}
.tag-label {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  writing-mode: vertical-rl;
  margin-left: 0.5rem;
  transform: rotate(180deg);
  position: relative;
  top: -0.2em;
}

/* Grid systems */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Scroll Progress (fixed to top) --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent-gradient);
  z-index: var(--z-progress);
  transition: width 0.1s linear;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: var(--bg-dark);
  border: 2px solid transparent;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  z-index: var(--z-backtop);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-med), visibility var(--transition-med), transform var(--transition-med), border-color var(--transition-fast);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--accent-light);
  border-color: var(--text-primary);
}
.back-to-top:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: none;
  }
}

/* --- Reduced motion class applied via JS --- */
.reduced-motion *,
.reduced-motion *::before,
.reduced-motion *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}