/* ===== SITE.CSS =====
   18新利体育平台共享样式
   核心概念：赛事数据终端、精密网格、速度线、脉冲光效
   ===================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@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;
  }
}

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 400;
  color: var(--cloud-white);
  background-color: var(--night-black);
  min-height: 100vh;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--volt-green);
  outline-offset: 3px;
  border-radius: 0px;
}

/* --- CSS Variables --- */
:root {
  --tech-blue: #0063F7;
  --volt-green: #00E68A;
  --night-black: #0A0E1C;
  --deep-space: #101826;
  --steel-blue: #1F3A5F;
  --data-cyan: #00B3D6;
  --alert-orange: #FF8B1A;
  --violet: #7B61FF;
  --silver-gray: #A8B3C4;
  --cloud-white: #F5F7FA;
  --dark-blue: #0A0E1C;
  --glass-bg: rgba(16, 24, 38, 0.72);
  --grid-line: rgba(0, 99, 247, 0.18);
  --grid-line-bright: rgba(0, 99, 247, 0.38);
  --content-width: 1280px;
  --header-height: 88px;
  --radius: 0px;
  --mono-font: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --sans-font: "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-speed: 0.35s;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--sans-font);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--cloud-white);
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 10000;
  padding: 12px 20px;
  background: var(--tech-blue);
  color: var(--cloud-white);
  font-family: var(--mono-font);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  border-radius: var(--radius);
  transition: top 0.2s ease;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
  color: var(--cloud-white);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(135deg, rgba(10, 14, 28, 0.96), rgba(16, 24, 38, 0.92));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 99, 247, 0.28);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.site-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--volt-green), var(--tech-blue), transparent);
  opacity: 0.5;
}

.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

/* Brand */
.brand-lockup {
  display: flex;
  align-items: center;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
}

.brand-mark {
  font-family: var(--mono-font);
  font-weight: 700;
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  color: var(--volt-green);
  letter-spacing: -0.06em;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2em;
  height: 1.4em;
  line-height: 1;
  border: 1px solid rgba(0, 230, 138, 0.4);
  transform: skewX(-6deg);
  background: rgba(0, 230, 138, 0.06);
  padding: 0 0.2em;
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: -2px;
  right: -2px;
  width: 4px;
  height: 4px;
  background: var(--volt-green);
  opacity: 0.5;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  transform: translateX(4px);
}

.brand-name {
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: 0.12em;
  color: var(--cloud-white);
  text-transform: uppercase;
}

.brand-descriptor {
  font-family: var(--mono-font);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--silver-gray);
  margin-top: 2px;
}

/* Desktop Navigation */
.site-nav {
  justify-self: end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 40px);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--silver-gray);
  letter-spacing: 0.05em;
  padding: 8px 0;
  position: relative;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--tech-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}

.nav-link:hover {
  color: var(--cloud-white);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--volt-green);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--volt-green);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  justify-self: end;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 230, 138, 0.08);
  border: 1px solid rgba(0, 230, 138, 0.25);
  border-radius: 999px;
  font-family: var(--mono-font);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--volt-green);
  white-space: nowrap;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--volt-green);
  position: relative;
  animation: pulse 1.8s infinite;
}

.status-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(0, 230, 138, 0.4);
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 230, 138, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(0, 230, 138, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 230, 138, 0); }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-family: var(--mono-font);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: background-color 0.25s ease, color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--tech-blue);
  color: var(--cloud-white);
  box-shadow: 0 4px 20px rgba(0, 99, 247, 0.35);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
  transition: left 0.45s ease;
}

.btn-primary:hover {
  background-color: #0056d6;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 99, 247, 0.5);
}

.btn-primary:hover::before {
  left: 100%;
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: rgba(0, 99, 247, 0.12);
  border: 1px solid rgba(0, 99, 247, 0.3);
  border-radius: var(--radius);
  position: relative;
  z-index: 1100;
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--cloud-white);
  transition: transform 0.3s var(--ease-out), opacity 0.3s ease, width 0.3s ease;
}

.nav-toggle-label {
  position: absolute;
  bottom: -18px;
  left: 0;
  right: 0;
  text-align: center;
  font-family: var(--mono-font);
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  color: var(--cloud-white);
  opacity: 0;
  transition: opacity 0.2s ease;
}

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

.nav-toggle[data-open="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-8px);
}

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

/* ===== SCROLL PROGRESS ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--tech-blue), var(--volt-green), var(--violet));
  z-index: 3000;
  pointer-events: none;
  box-shadow: 0 0 12px rgba(0, 230, 138, 0.35);
}

/* ===== FOOTER ===== */
.site-footer {
  background-color: var(--deep-space);
  position: relative;
  margin-top: 80px;
  border-top: 1px solid rgba(0, 99, 247, 0.22);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--tech-blue), transparent);
}

.site-footer::after {
  content: "18/14";
  position: absolute;
  bottom: -30px;
  right: -28px;
  font-family: var(--mono-font);
  font-weight: 700;
  font-size: clamp(6rem, 20vw, 14rem);
  line-height: 1;
  color: rgba(0, 99, 247, 0.05);
  pointer-events: none;
  z-index: 0;
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 56px;
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
  gap: 40px;
  position: relative;
  z-index: 1;
}

.footer-brand-block {
  padding-right: 24px;
}

.brand-lockup--footer {
  margin-bottom: 20px;
}

.trust-statement {
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--silver-gray);
  border-left: 2px solid var(--tech-blue);
  padding-left: 16px;
  margin-top: 20px;
}

.footer-heading {
  font-family: var(--mono-font);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 8px;
}

.footer-heading::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 1px;
  background: var(--tech-blue);
}

.footer-links {
  display: grid;
  gap: 12px;
}

.footer-links .footer-legal-link,
.footer-links a {
  font-size: 0.875rem;
  color: var(--silver-gray);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-links a::before {
  content: "▸";
  color: var(--tech-blue);
  font-size: 0.7rem;
}

.footer-links a:hover {
  color: var(--volt-green);
  transform: translateX(4px);
}

.footer-contact-list {
  display: grid;
  gap: 12px;
}

.footer-contact-item {
  display: grid;
  gap: 2px;
}

.footer-contact-label {
  font-family: var(--mono-font);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet);
}

.footer-contact-value {
  font-size: 0.875rem;
  color: var(--cloud-white);
  word-break: break-word;
}

.footer-meta {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
  position: relative;
  z-index: 1;
  background: rgba(10, 14, 28, 0.3);
}

.footer-meta-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-copyright,
.footer-icp {
  font-size: 0.75rem;
  color: var(--silver-gray);
  font-family: var(--mono-font);
}

.footer-icp {
  color: var(--silver-gray);
}

/* ===== GENERIC COMPONENTS ===== */
/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  padding: 24px 0;
}

.info-panel {
  background: var(--deep-space);
  border: 1px solid rgba(0, 99, 247, 0.16);
  padding: 24px;
  position: relative;
  transition: border-color 0.3s ease, transform 0.3s ease;
  cursor: pointer;
  border-radius: var(--radius);
}

.info-panel:hover {
  border-color: var(--tech-blue);
  transform: translateY(-4px);
}

.panel-index {
  font-family: var(--mono-font);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--violet);
  margin-bottom: 8px;
}

.panel-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.panel-desc {
  font-size: 0.875rem;
  color: var(--silver-gray);
  line-height: 1.6;
}

/* Image Frame */
.image-frame {
  position: relative;
  width: 100%;
  padding-bottom: 62.5%; /* 16:10 */
  background-color: var(--deep-space);
  border: 1px solid var(--grid-line);
  overflow: hidden;
  isolation: isolate;
}

.image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 99, 247, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 99, 247, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: -1;
}

.image-frame::after {
  content: "";
  position: absolute;
  width: 80%;
  height: 80%;
  top: -20%;
  left: -20%;
  background: radial-gradient(circle, rgba(0, 230, 138, 0.12), transparent 70%);
  z-index: -1;
}

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

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--deep-space);
  border: 1px solid rgba(0, 99, 247, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.2s ease;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--volt-green);
}

.back-to-top::before {
  content: "↑";
  font-family: var(--mono-font);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--tech-blue);
  transition: color 0.2s ease;
}

.back-to-top:hover::before {
  color: var(--volt-green);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .header-inner {
    grid-template-columns: 1fr auto;
    gap: 16px;
    padding: 0 20px;
  }

  .site-nav {
    justify-self: auto;
  }

  .status-chip {
    display: none;
  }

  .nav-list {
    gap: 16px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .brand-descriptor {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }

  .header-actions > .btn-primary {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 28, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(-100%);
    transition: transform 0.35s var(--ease-out);
    z-index: 1050;
  }

  .site-nav[data-open="true"] {
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    gap: 8px;
    padding: 32px 0;
    text-align: center;
  }

  .nav-link {
    font-size: 1.25rem;
    padding: 12px 24px;
    display: inline-block;
    width: auto;
  }

  .nav-toggle[data-open="true"] ~ .site-nav {
    transform: translateY(0);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding: 40px 20px 32px;
    gap: 32px;
  }

  .footer-brand-block {
    padding-right: 0;
  }

  .footer-meta-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .brand-mark {
    font-size: 1.125rem;
  }

  .brand-name {
    font-size: 0.938rem;
    letter-spacing: 0.06em;
  }

  .header-inner {
    padding: 0 16px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}