/* ==========================================================================
   三亿体育APP · SITE.CSS
   共享样式：竞技场 / 速度线 / 斜切分割 / 数据流
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --bg-base: #0A1128;
  --bg-alt: #162044;
  --bg-card: #101C3C;
  --fg-primary: #F2F4F8;
  --fg-muted: #8A94A6;
  --accent-green: #39FF14;
  --accent-red: #E10600;
  --accent-cyan: #00E5FF;
  --accent-warm: #FFB300;
  --line-subtle: #2A3558;
  --overlay-dark: #080D1A;

  --font-display: "DIN Alternate", "Impact", "Arial Black", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", sans-serif;

  --text-h1: clamp(2.5rem, 6vw, 4.5rem);
  --text-h2: clamp(1.8rem, 4vw, 2.8rem);
  --text-h3: clamp(1.4rem, 3vw, 2rem);
  --text-h4: clamp(1.1rem, 2vw, 1.4rem);
  --text-lead: 1.1rem;
  --text-body: 1rem;
  --text-sm: 0.875rem;

  --container-max: 1280px;
  --container-pad: clamp(1rem, 3vw, 2rem);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 0.2s;
  --duration-slow: 0.6s;

  color-scheme: dark;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  background: var(--bg-base);
  color: var(--fg-primary);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

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

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

li {
  margin: 0;
  padding: 0;
}

address {
  font-style: normal;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin: 0 0 0.6em;
  text-wrap: balance;
}

p {
  margin: 0 0 1em;
}

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

::selection {
  background: var(--accent-green);
  color: var(--bg-base);
}

/* ---------- 3. 无障碍 ---------- */
.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;
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 400;
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--accent-green);
  color: var(--bg-base);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 50%, calc(100% - 10px) 100%, 0 100%);
  transition: top 0.25s var(--ease-out);
}

.skip-link:focus {
  top: 1rem;
}

/* ---------- 4. 滚动进度线 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 500;
  pointer-events: none;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan), var(--accent-red));
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.5);
  transition: width 0.12s linear;
}

/* ---------- 5. 容器与章节 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  position: relative;
}

.section--alt {
  background: var(--bg-alt);
}

.section--dark {
  background: var(--overlay-dark);
}

.section--tight {
  padding-block: clamp(1.5rem, 4vw, 3rem);
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--text-h2);
  color: var(--fg-primary);
}

.section-heading::before {
  content: "";
  flex: 0 0 auto;
  width: 1.6rem;
  height: 4px;
  background: var(--accent-red);
  transform: skewX(-45deg);
}

.section-lead {
  font-size: var(--text-lead);
  line-height: 1.8;
  color: var(--fg-muted);
  max-width: 68ch;
}

/* ---------- 6. 网格 ---------- */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 1.5rem;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1024px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  background: transparent;
  border: 1px solid var(--line-subtle);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--fg-primary);
  text-decoration: none;
  cursor: pointer;
  transform: skewX(-6deg);
  transition: background-color var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.btn::after {
  content: "";
  width: 1.1rem;
  height: 2px;
  background: currentColor;
  opacity: 0.5;
  transition: width var(--duration-fast) var(--ease-out), opacity var(--duration-fast);
}

.btn:hover::after {
  width: 1.7rem;
  opacity: 1;
}

.btn--primary {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: var(--bg-base);
}

.btn--primary:hover {
  box-shadow: 0 0 1.25rem rgba(57, 255, 20, 0.35);
}

.btn--ghost:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  box-shadow: inset 0 0 0 1px rgba(57, 255, 20, 0.2);
}

.btn--sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-block: 1rem 0.5rem;
  font-size: var(--text-sm);
  color: var(--fg-muted);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line-subtle);
  transform: skewX(-20deg);
  display: inline-block;
}

.breadcrumb__link {
  color: var(--fg-muted);
  transition: color var(--duration-fast);
}

.breadcrumb__link:hover {
  color: var(--accent-green);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--fg-primary);
}

/* ---------- 9. 正文 ---------- */
.prose {
  max-width: 72ch;
  color: var(--fg-muted);
}

.prose h2,
.prose h3,
.prose h4 {
  color: var(--fg-primary);
  margin-top: 2.5rem;
}

.prose h2 {
  font-size: var(--text-h3);
}

.prose h3 {
  font-size: var(--text-h4);
}

.prose p {
  margin-bottom: 1.2rem;
}

.prose a {
  color: var(--accent-green);
  border-bottom: 1px solid rgba(57, 255, 20, 0.3);
}

.prose ul {
  margin-bottom: 1.2rem;
}

.prose li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.4rem;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.8rem;
  height: 2px;
  background: var(--accent-green);
  transform: skewX(-45deg);
}

/* ---------- 10. 基础组件 ---------- */
.card {
  position: relative;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--line-subtle);
  border-left: 3px solid var(--accent-green);
  transition: transform var(--duration-fast) var(--ease-out),
              border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: 0 0.75rem 2rem rgba(0, 0, 0, 0.35);
}

.card__title {
  font-size: var(--text-h4);
  color: var(--fg-primary);
  margin-bottom: 0.5rem;
}

.card__body {
  font-size: var(--text-sm);
  color: var(--fg-muted);
  line-height: 1.7;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent-cyan);
}

.stat__value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  color: var(--fg-primary);
  letter-spacing: 0.02em;
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--fg-muted);
  letter-spacing: 0.08em;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
  border: 1px solid var(--line-subtle);
  background: transparent;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 100%, 8px 100%);
}

.tag--red {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.tag--green {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.media {
  position: relative;
  overflow: hidden;
  background: var(--bg-alt);
  border: 1px solid var(--line-subtle);
}

.media--16x9 {
  aspect-ratio: 16 / 9;
}

.media--4x3 {
  aspect-ratio: 4 / 3;
}

.media--1x1 {
  aspect-ratio: 1 / 1;
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.media:hover .media__img {
  transform: scale(1.03);
}

/* ---------- 11. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 17, 40, 0.94);
  border-bottom: 1px solid var(--line-subtle);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg,
    var(--accent-green) 0 12%,
    var(--accent-cyan) 12% 18%,
    var(--accent-red) 18% 36%,
    transparent 36%);
}

.site-header__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.site-header__masthead {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: 1.1rem 0.9rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--fg-primary);
  text-decoration: none;
  transition: opacity var(--duration-fast);
}

.site-brand:hover {
  opacity: 0.92;
}

.site-brand__wordmark {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4.5vw, 2.25rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--fg-primary);
  white-space: nowrap;
}

.site-brand__app {
  color: var(--accent-green);
}

.site-brand__badge {
  display: inline-block;
  padding: 0.3rem 0.55rem 0.3rem 0.7rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--fg-primary);
  background: var(--accent-red);
  white-space: nowrap;
  transform: skewX(-12deg);
  box-shadow: 0 2px 8px rgba(224, 6, 0, 0.35);
}

.site-brand__speedline {
  display: inline-block;
  width: 3.25rem;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), rgba(57, 255, 20, 0));
  transform: skewX(-45deg);
  opacity: 0.7;
  transition: width 0.3s var(--ease-out);
}

.site-brand:hover .site-brand__speedline {
  width: 4.5rem;
}

/* 移动导航按钮 */
.site-nav-toggle {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  background: var(--bg-alt);
  border: 1px solid var(--line-subtle);
  color: var(--fg-primary);
  transition: border-color var(--duration-fast), background-color var(--duration-fast);
}

.site-nav-toggle:hover {
  border-color: var(--accent-green);
}

.site-nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 24px;
}

.site-nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--fg-primary);
  border-radius: 1px;
  transition: transform 0.3s var(--ease-out), opacity 0.2s;
}

.site-nav-toggle__bar--top,
.site-nav-toggle__bar--bot {
  transform-origin: center;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar--top {
  transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar--mid {
  opacity: 0;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar--bot {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 12. 主导航 ---------- */
.site-nav {
  width: 100%;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease-out);
}

.site-nav[data-open] {
  max-height: 26rem;
}

.site-nav__item {
  margin: 0;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
}

.site-nav__link {
  display: block;
  padding: 0.8rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  border-bottom: 1px solid rgba(42, 53, 88, 0.5);
  position: relative;
  transition: color var(--duration-fast);
}

.site-nav__link:hover {
  color: var(--fg-primary);
}

.site-nav__link[aria-current="page"] {
  color: var(--accent-green);
}

@media (min-width: 769px) {
  .site-nav {
    max-height: none;
    overflow: visible;
    border-top: 1px solid var(--line-subtle);
  }

  .site-nav__list {
    flex-direction: row;
    justify-content: center;
    gap: 0.25rem;
  }

  .site-nav__link {
    padding: 0.8rem 1.1rem 0.9rem;
    border-bottom: none;
    font-size: 0.875rem;
    letter-spacing: 0.1em;
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--accent-green);
    transform: translateX(-50%) skewX(-45deg);
    box-shadow: 0 0 10px rgba(57, 255, 20, 0.4);
    transition: width 0.3s var(--ease-out);
  }

  .site-nav__link:hover::after,
  .site-nav__link:focus-visible::after {
    width: 65%;
  }

  .site-nav__link[aria-current="page"]::after {
    width: 65%;
  }

  .site-nav__link[aria-current="page"] {
    color: var(--fg-primary);
  }

  .site-nav-toggle {
    display: none;
  }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  background: var(--overlay-dark);
  border-top: 1px solid var(--line-subtle);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: repeating-linear-gradient(-45deg,
    var(--accent-green) 0 8px,
    transparent 8px 12px,
    var(--accent-red) 12px 20px,
    transparent 20px 24px);
  opacity: 0.55;
}

.site-footer__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 3.5rem var(--container-pad) 2.75rem;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2.25rem 2.5rem;
}

.site-footer__brand {
  grid-column: span 4;
}

.site-footer__col {
  grid-column: span 2;
}

.site-footer__contact {
  grid-column: span 4;
}

.site-brand--footer {
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.site-brand--footer .site-brand__wordmark {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

.site-brand--footer .site-brand__speedline {
  width: 2.25rem;
}

.site-footer__trust {
  color: var(--fg-muted);
  font-size: var(--text-sm);
  line-height: 1.8;
  max-width: 46ch;
}

.site-footer__heading {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent-green);
  margin-bottom: 1rem;
  padding-left: 1.1rem;
  position: relative;
}

.site-footer__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.8rem;
  height: 2px;
  background: var(--accent-red);
  transform: skewX(-45deg);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.site-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--fg-muted);
  font-size: var(--text-sm);
  transition: color var(--duration-fast);
}

.site-footer__link::before {
  content: "";
  width: 0.7rem;
  height: 2px;
  background: var(--accent-green);
  opacity: 0.4;
  transform: skewX(-45deg);
  flex: 0 0 auto;
  transition: opacity var(--duration-fast), width var(--duration-fast);
}

.site-footer__link:hover {
  color: var(--fg-primary);
}

.site-footer__link:hover::before {
  opacity: 1;
  width: 1rem;
}

.site-footer__address {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  color: var(--fg-muted);
  font-size: var(--text-sm);
}

.site-footer__addr-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  line-height: 1.6;
}

.site-footer__addr-label {
  flex: 0 0 auto;
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.site-footer__addr-value {
  word-break: break-all;
}

.site-footer__bottom {
  border-top: 1px solid rgba(42, 53, 88, 0.6);
}

.site-footer__bottom-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 1.1rem var(--container-pad);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  color: var(--fg-muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.site-footer__icp {
  color: var(--fg-muted);
}

/* ---------- 14. 右下角联系入口 ---------- */
.contact-fab {
  position: fixed;
  right: 1.1rem;
  bottom: 1.1rem;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1.1rem;
  background: var(--accent-green);
  color: var(--bg-base);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4), 0 0 14px rgba(57, 255, 20, 0.25);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast);
}

.contact-fab::before {
  content: "";
  width: 0.8rem;
  height: 2px;
  background: var(--bg-base);
  transform: skewX(-45deg);
}

.contact-fab:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45), 0 0 20px rgba(57, 255, 20, 0.35);
}

/* ---------- 15. 滚动渐显 ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
}

html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.65s var(--ease-out), transform 0.65s var(--ease-out);
}

html.js-reveal [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

html.js-reveal [data-reveal][data-delay-1] {
  transition-delay: 0.1s;
}

html.js-reveal [data-reveal][data-delay-2] {
  transition-delay: 0.2s;
}

html.js-reveal [data-reveal][data-delay-3] {
  transition-delay: 0.3s;
}

/* ---------- 16. 响应式微调 ---------- */
@media (max-width: 1024px) and (min-width: 769px) {
  .site-footer__brand {
    grid-column: span 6;
  }

  .site-footer__col {
    grid-column: span 3;
  }

  .site-footer__contact {
    grid-column: span 6;
  }
}

@media (max-width: 768px) {
  .site-header__masthead {
    padding-block: 0.9rem 0.75rem;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 2.25rem;
    padding-top: 2.75rem;
  }

  .site-footer__brand,
  .site-footer__col,
  .site-footer__contact {
    grid-column: span 1;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

@media (max-width: 640px) {
  .site-brand__speedline {
    display: none;
  }

  .site-brand__badge {
    margin-left: 0.15rem;
  }
}

/* ---------- 17. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html.js-reveal [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-progress {
    transition: none;
  }
}