/* ==========================================================================
   亿动体育 · 共享样式 /assets/site.css
   1 变量与重置 · 2 中文排版 · 3 布局容器 · 4 页头 · 5 页脚
   6 基础组件 · 7 响应式 · 8 动效与无障碍
   ========================================================================== */

/* ---------- 1 · 变量与重置 ---------- */
:root {
  --deep: #041B2A;
  --layer: #0A2C42;
  --line: #16465F;
  --cyan: #35F2D0;
  --cyan-dim: #13BFA4;
  --coral: #FF6B4A;
  --violet: #8A7CFF;
  --paper: #F4FAFC;
  --ink: #03121B;
  --gray: #8EA6B4;

  --cyan-a10: rgba(53, 242, 208, 0.10);
  --cyan-a20: rgba(53, 242, 208, 0.20);
  --coral-a45: rgba(255, 107, 74, 0.45);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-num: "Barlow Condensed", "DIN Alternate", "Roboto Condensed", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --maxw: 1320px;
  --gutter: clamp(20px, 4.5vw, 68px);
  --gap: clamp(16px, 2.4vw, 28px);
  --band: clamp(48px, 7vw, 96px);
  --radius: 3px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.18s;
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body,
h1, h2, h3, h4, h5, p,
ul, ol, dl, figure, blockquote, hr {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

img {
  height: auto;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

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

table {
  width: 100%;
  border-collapse: collapse;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
}

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

/* ---------- 2 · 中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--deep);
  background-image:
    radial-gradient(circle at 84% -8%, rgba(53, 242, 208, 0.10), transparent 46%),
    radial-gradient(circle at 2% 6%, rgba(138, 124, 255, 0.10), transparent 42%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

strong {
  font-weight: 700;
  color: var(--paper);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.75;
  color: var(--gray);
}

.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper);
}

.prose p + p {
  margin-top: 1.1em;
}

.prose h2,
.prose h3 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

.prose ul,
.prose ol {
  margin-block: 1em;
  padding-left: 1.4em;
  list-style: disc;
}

.prose li + li {
  margin-top: 0.45em;
}

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.stat-number {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(53, 242, 208, 0.06);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.tag--coral {
  border-color: var(--coral-a45);
  background: rgba(255, 107, 74, 0.08);
  color: var(--coral);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 3 · 布局容器 ---------- */
.container,
.header-inner,
.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumbs a {
  color: var(--gray);
  transition: color var(--dur) var(--ease);
}

.breadcrumbs a:hover {
  color: var(--cyan);
}

.breadcrumbs [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 4 · 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--deep);
}

.skip-link {
  position: absolute;
  top: -140px;
  left: var(--gutter);
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: top var(--dur) var(--ease);
}

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

.header-utility {
  background: var(--layer);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.header-utility .header-inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 38px;
}

.utility-line {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: none;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--paper);
  white-space: nowrap;
}

.utility-sep {
  display: inline-block;
  flex: none;
  width: 18px;
  height: 1px;
  background: var(--cyan);
}

.utility-meta {
  min-width: 0;
  overflow: hidden;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--gray);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.utility-links {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 22px);
  margin-left: auto;
  flex: none;
}

.utility-links a {
  display: inline-block;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--gray);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.utility-links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan-dim);
}

.header-main {
  background-color: var(--deep);
  border-bottom: 1px solid var(--line);
}

.header-main .header-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 44px);
  min-height: 76px;
}

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

.brand-mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  overflow: hidden;
  border: 1px solid var(--cyan);
  background:
    linear-gradient(140deg,
      transparent calc(50% - 1px),
      var(--cyan) calc(50% - 1px),
      var(--cyan) calc(50% + 1px),
      transparent calc(50% + 1px)),
    var(--cyan-a10);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 14px;
  height: 14px;
  background: var(--coral);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.brand-text {
  display: block;
  min-width: 0;
}

.brand-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.brand-sub {
  display: block;
  font-family: var(--font-num);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--layer);
  color: var(--paper);
  font-size: 13px;
  font-weight: 600;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

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

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.10);
  color: var(--cyan);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  border-top: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
}

.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  background: currentColor;
  transform: translateY(-50%);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  opacity: 0;
  transform: translateY(-50%) rotate(90deg);
}

.nav-toggle-label {
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 30px);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--paper);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

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

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

.nav-link[aria-current="page"] {
  color: var(--cyan);
}

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

.button.nav-cta {
  padding: 9px 18px;
  font-size: 14px;
  white-space: nowrap;
}

/* ---------- 5 · 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--band);
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(22, 70, 95, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 70, 95, 0.45) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.62), transparent 68%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.62), transparent 68%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-dim) 42%, var(--violet) 78%, transparent);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 1.6fr;
  gap: clamp(24px, 3.6vw, 56px);
  padding-block: clamp(44px, 6vw, 80px) clamp(30px, 4vw, 52px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.brand--footer {
  margin-bottom: 18px;
}

.brand--footer .brand-name {
  font-size: 22px;
}

.footer-statement {
  max-width: 20em;
  margin-bottom: 22px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.footer-cta {
  margin-top: 2px;
}

.footer-col {
  min-width: 0;
}

.footer-contact {
  min-width: 0;
}

.footer-col-title {
  position: relative;
  margin-bottom: 18px;
  padding-bottom: 11px;
  font-family: var(--font-num);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-col-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 1px;
  background: var(--cyan-dim);
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-links a {
  display: inline-block;
  font-size: 15px;
  color: var(--gray);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-links a:hover {
  color: var(--cyan);
  transform: translateX(2px);
}

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

.contact-item {
  display: grid;
  gap: 1px;
}

.contact-label {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-dim);
}

.contact-value {
  font-size: 15px;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.contact-note {
  margin-top: 16px;
  padding-left: 11px;
  border-left: 2px solid var(--coral);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--gray);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-block: 20px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--gray);
}

.footer-copyright {
  letter-spacing: 0.02em;
}

.footer-icp {
  font-family: var(--font-num);
  letter-spacing: 0.08em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-left: auto;
}

.footer-legal a {
  border-bottom: 1px solid transparent;
  color: var(--gray);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-legal a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan-dim);
}

/* ---------- 6 · 基础组件 ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: none;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.02em;
  text-align: center;
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.button--accent {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
}

.button--accent:hover {
  border-color: var(--cyan-dim);
  background: var(--cyan-dim);
}

.button--ghost {
  border-color: var(--cyan-dim);
  background: transparent;
  color: var(--cyan);
}

.button--ghost:hover {
  border-color: var(--cyan);
  background: var(--cyan-a10);
}

.button--coral {
  border-color: var(--coral);
  background: var(--coral);
  color: var(--ink);
}

.button--coral:hover {
  filter: brightness(1.09);
}

.button--quiet {
  padding: 6px 2px;
  border: 0;
  border-bottom: 1px solid var(--cyan-dim);
  border-radius: 0;
  background: none;
  font-size: 14px;
  color: var(--cyan);
}

.button--quiet:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--layer);
  transition:
    transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.card--lift:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-dim);
}

.card--outline {
  background: transparent;
}

.tabs {
  position: relative;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.tab {
  position: relative;
  padding: 10px 18px;
  border: 0;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--gray);
  cursor: pointer;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background-color var(--dur) var(--ease);
}

.tab:hover {
  color: var(--paper);
}

.tab[aria-selected="true"] {
  color: var(--cyan);
}

.tab[aria-selected="true"]::after {
  background: var(--cyan);
}

.tabpanel {
  padding-top: 22px;
}

.tabpanel[hidden] {
  display: none;
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(53, 242, 208, 0.10), transparent 42%),
    radial-gradient(circle at 78% 18%, rgba(138, 124, 255, 0.22), transparent 55%),
    var(--layer);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(22, 70, 95, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 70, 95, 0.55) 1px, transparent 1px);
  background-size: 36px 36px;
  opacity: 0.5;
  pointer-events: none;
}

.media-frame img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ---------- 7 · 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-link {
    font-size: 14px;
  }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .grid-12 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 120;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 4px var(--gutter) 22px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    background: var(--layer);
    border-top: 1px solid var(--line);
    border-bottom: 2px solid var(--cyan);
    box-shadow: 0 24px 48px rgba(2, 10, 16, 0.55);
  }

  .site-nav[data-open] {
    display: flex;
  }

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

  .nav-item {
    border-bottom: 1px solid var(--line);
  }

  .nav-link {
    display: block;
    padding: 14px 12px;
    font-size: 16px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link[aria-current="page"] {
    padding-left: 10px;
    border-left: 2px solid var(--cyan);
  }

  .button.nav-cta {
    width: 100%;
    margin-top: 18px;
    padding: 13px 18px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .header-main .header-inner {
    min-height: 64px;
  }

  .utility-line,
  .utility-meta {
    display: none;
  }

  .utility-links {
    margin-inline: auto;
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-legal {
    margin-left: 0;
    gap: 8px 16px;
  }
}

@media (max-width: 560px) {
  .grid-12 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

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

  .brand-sub {
    letter-spacing: 0.18em;
  }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-brand {
    grid-column: auto;
  }
}

/* ---------- 8 · 动效与无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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