/* 亿德体育 Site Kit 共享样式
   路径：/assets/site.css
   设计语言：海报分层 / 斜切动势 / 中国红×赛场绿×金属银 */

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

/* === CSS 变量 === */
:root {
  --color-red: #D02B2B;
  --color-red-deep: #9B1C1C;
  --color-green: #2E7D32;
  --color-silver: #A8B0BC;
  --color-black: #141414;
  --color-cream: #F7F5EF;
  --color-yellow: #F6C200;
  --color-fog: #E5E9EC;

  --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --font-data: "DIN Alternate", "Bahnschrift", "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --container-width: 1200px;

  --shadow-card: 0 6px 18px rgba(20, 20, 20, 0.14);
  --shadow-strong: 6px 6px 0 var(--color-black);

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 48px;
  --space-5: 80px;

  --radius: 4px;
}

/* === 基础排版 === */
html {
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-black);
  background: var(--color-cream);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-black);
}

p {
  margin-bottom: 0;
}

ul, ol {
  list-style-position: inside;
}

a {
  color: var(--color-red);
}

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

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

::selection {
  background: var(--color-red);
  color: #fff;
}

/* === JS 开关，无 JS 时内容自然可见 === */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.js-enabled [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

.js-enabled [data-reveal][data-delay="1"] { transition-delay: 0.1s; }
.js-enabled [data-reveal][data-delay="2"] { transition-delay: 0.2s; }
.js-enabled [data-reveal][data-delay="3"] { transition-delay: 0.3s; }

/* === 容器与布局 === */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

@media (min-width: 600px) {
  .container {
    padding-inline: var(--space-3);
  }
}

.page-main {
  flex: 1 0 auto;
  min-height: 60vh;
}

.section {
  padding: var(--space-4) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-5) 0;
  }
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-red);
  background: var(--color-fog);
  border-left: 3px solid var(--color-red);
  padding: 0.3rem 0.8rem;
  margin-bottom: var(--space-2);
}

.prose {
  max-width: 72ch;
  font-size: 1rem;
  line-height: 1.85;
  color: #2a2a2a;
}

.prose p {
  margin-bottom: var(--space-2);
}

.prose h2,
.prose h3 {
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

/* === 无障碍跳转 === */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  background: var(--color-black);
  color: #fff;
  padding: 0.6rem 1.2rem;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 3px solid var(--color-yellow);
}

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

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.6rem 1.4rem;
  background: var(--color-cream);
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.95rem;
  line-height: 1.2;
  text-decoration: none;
  color: var(--color-black);
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--color-black);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-black);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--color-black);
}

.btn-primary {
  background: var(--color-red);
  border-color: var(--color-red-deep);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-red-deep);
}

.btn-outline {
  background: transparent;
}

.btn-large {
  min-height: 52px;
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}

/* === 面包屑 === */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.4rem;
  max-width: var(--container-width);
  margin-inline: auto;
  padding: var(--space-2);
  font-size: 0.85rem;
  color: var(--color-silver);
}

@media (min-width: 600px) {
  .breadcrumb {
    padding-inline: var(--space-3);
  }
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--color-silver);
}

.breadcrumb a {
  color: var(--color-red);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-black);
  font-weight: 700;
}

/* === 栅格 === */
.grid-2,
.grid-3 {
  display: grid;
  gap: var(--space-3);
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* === 卡片 === */
.card {
  position: relative;
  background: var(--color-cream);
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-strong);
  padding: var(--space-3);
}

.card-dark {
  background: var(--color-black);
  border-color: var(--color-black);
  color: var(--color-cream);
}

.card-dark h1,
.card-dark h2,
.card-dark h3,
.card-dark h4 {
  color: #fff;
}

.card-red {
  background: var(--color-red);
  border-color: var(--color-red-deep);
  color: #fff;
}

.card-red h1,
.card-red h2,
.card-red h3,
.card-red h4 {
  color: #fff;
}

/* === 标签 === */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.65rem;
  background: var(--color-fog);
  border: 1px solid var(--color-silver);
  border-radius: 2px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-black);
  white-space: nowrap;
}

.tag-red {
  background: var(--color-red);
  border-color: var(--color-red-deep);
  color: #fff;
}

.tag-green {
  background: var(--color-green);
  border-color: var(--color-green);
  color: #fff;
}

.tag-yellow {
  background: var(--color-yellow);
  border-color: var(--color-black);
  color: var(--color-black);
}

/* === 数据数字 === */
.data-number {
  font-family: var(--font-data);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-red);
  font-variant-numeric: tabular-nums;
}

.data-number[data-size="large"] {
  font-size: 3rem;
}

/* === 图片容器基础规则 === */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--color-fog);
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  box-shadow: var(--shadow-strong);
}

.img-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.img-frame[data-ratio="4-3"]::before {
  padding-top: 75%;
}

.img-frame[data-ratio="1-1"]::before {
  padding-top: 100%;
}

.img-frame[data-ratio="3-4"]::before {
  padding-top: 133.34%;
}

.img-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-fog) 0 10px,
    var(--color-silver) 10px 20px
  );
  color: var(--color-black);
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* === 头部 === */
.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-cream);
  border-bottom: 3px solid var(--color-black);
}

.site-header::after {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-red) 0 10px,
    var(--color-black) 10px 20px,
    var(--color-yellow) 20px 30px,
    var(--color-green) 30px 40px
  );
}

.countdown-bar {
  background: var(--color-red);
  color: #fff;
  font-family: var(--font-data);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-align: center;
  padding: 0.45rem 1rem;
  border-bottom: 2px solid var(--color-red-deep);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.countdown-bar::before {
  content: "●";
  color: var(--color-yellow);
  font-size: 0.65rem;
  margin-right: 0.45rem;
  vertical-align: middle;
  animation: countdown-pulse 1.6s ease-in-out infinite alternate;
}

@keyframes countdown-pulse {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0.4;
    transform: scale(0.7);
  }
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
  max-width: var(--container-width);
  margin-inline: auto;
  padding: var(--space-2);
}

@media (min-width: 600px) {
  .masthead {
    padding: var(--space-2) var(--space-3);
  }
}

.masthead-left {
  justify-self: start;
}

.masthead-right {
  justify-self: end;
}

/* 品牌 */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
  color: var(--color-black);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--color-red);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.4rem;
  line-height: 1;
  border: 2px solid var(--color-black);
  box-shadow: 3px 3px 0 var(--color-black);
  transform: rotate(-6deg);
  transform-origin: center;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-black);
  letter-spacing: 0.02em;
}

.brand-name::after {
  content: "";
  display: block;
  height: 3px;
  background: var(--color-red);
  margin-top: 3px;
  width: 100%;
}

/* 头部下载按钮 */
.header-download {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  background: var(--color-red);
  color: #fff;
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--color-black);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.85rem;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.header-download:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--color-black);
  background: var(--color-red-deep);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  background: var(--color-black);
  color: #fff;
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--color-red);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.85rem;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.nav-toggle:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--color-red-deep);
}

.nav-toggle[data-open] {
  background: var(--color-red);
  border-color: var(--color-red-deep);
}

.nav-toggle-label {
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  position: relative;
  border-radius: 2px;
  transition: transform 0.2s ease, top 0.2s ease, background 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[data-open] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[data-open] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[data-open] .nav-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 主导航 */
.site-nav {
  background: var(--color-black);
}

.site-nav-list {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  max-width: var(--container-width);
  margin-inline: auto;
}

.site-nav-item {
  list-style: none;
}

.site-nav-link {
  display: block;
  position: relative;
  padding: 0.9rem 1.5rem;
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0;
  background: var(--color-red);
  transition: height 0.2s ease;
}

.site-nav-link:hover {
  background: var(--color-red-deep);
  color: #fff;
}

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

.site-nav-link[aria-current="page"]::after {
  height: 4px;
}

/* === 页脚 === */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--color-black) 0%, #1a1a1a 100%);
  color: var(--color-cream);
  border-top: 5px solid var(--color-red);
  margin-top: var(--space-5);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  max-width: var(--container-width);
  margin-inline: auto;
  padding: var(--space-4) var(--space-2);
}

@media (min-width: 600px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
    padding-inline: var(--space-3);
  }
}

@media (min-width: 1000px) {
  .footer-main {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-4);
  }
}

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

@media (min-width: 1000px) {
  .footer-brand {
    grid-column: auto;
  }
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
  margin-bottom: var(--space-2);
}

.footer-logo .brand-mark {
  width: 36px;
  height: 36px;
  font-size: 1.2rem;
  box-shadow: 3px 3px 0 var(--color-red-deep);
}

.footer-logo .brand-name {
  color: #fff;
  font-size: 1.4rem;
}

.footer-logo .brand-name::after {
  background: var(--color-red);
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-fog);
  max-width: 36em;
  margin-bottom: var(--space-2);
}

.footer-trust {
  font-size: 0.82rem;
  color: var(--color-silver);
  border-left: 3px solid var(--color-red);
  padding-left: var(--space-2);
}

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

.footer-nav,
.footer-policy,
.footer-contact {
  min-width: 0;
}

.footer-contact .footer-heading {
  color: var(--color-yellow);
}

.footer-policy .footer-heading::after {
  background: var(--color-green);
}

.footer-heading {
  color: #fff;
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  padding-bottom: 0.4rem;
  border-bottom: 2px solid rgba(255, 255, 255, 0.12);
  position: relative;
}

.footer-heading::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-red);
}

.footer-list {
  list-style: none;
}

.footer-list li {
  font-size: 0.85rem;
  line-height: 2;
  color: var(--color-fog);
}

.footer-list a {
  color: var(--color-fog);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-list a:hover {
  color: var(--color-yellow);
}

.footer-contact-list li {
  padding-left: 0.4rem;
  border-left: 2px solid var(--color-red);
  margin-bottom: 0.15rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(0, 0, 0, 0.25);
}

.footer-bottom-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  max-width: var(--container-width);
  margin-inline: auto;
  padding: var(--space-2);
}

@media (min-width: 600px) {
  .footer-bottom-inner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    padding-inline: var(--space-3);
  }
}

.footer-copyright,
.footer-icp {
  font-size: 0.8rem;
  color: var(--color-silver);
}

.footer-bottom-links {
  display: flex;
  list-style: none;
  gap: var(--space-2);
}

.footer-bottom-links a {
  color: var(--color-silver);
  font-size: 0.8rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-bottom-links a:hover {
  color: var(--color-yellow);
}

/* === 返回顶部 === */
.back-to-top {
  position: fixed;
  right: var(--space-2);
  bottom: var(--space-2);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: var(--color-black);
  color: #fff;
  border: 2px solid var(--color-black);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 var(--color-red);
  font-family: var(--font-data);
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.3s ease;
}

.back-to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-red);
  border-color: var(--color-red-deep);
}

/* === 响应式头部与导航 === */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
  }

  .site-nav[data-open] {
    display: block;
    border-top: 3px solid var(--color-red);
  }

  .site-nav-list {
    flex-direction: column;
    padding: var(--space-1) 0;
  }

  .site-nav-link {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-nav-link::after {
    height: auto;
    width: 0;
    bottom: auto;
    top: 0;
    transition: width 0.2s ease;
  }

  .site-nav-link[aria-current="page"]::after {
    width: 4px;
    height: auto;
  }
}

@media (max-width: 600px) {
  .countdown-bar {
    font-size: 0.72rem;
    letter-spacing: 0.02em;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  .brand-name {
    font-size: 1.35rem;
  }
}

@media (max-width: 400px) {
  .nav-toggle-label {
    display: none;
  }

  .header-download {
    padding: 0.4rem 0.6rem;
    font-size: 0.78rem;
  }
}

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

  .js-enabled [data-reveal],
  .js-enabled [data-reveal][data-delay="1"],
  .js-enabled [data-reveal][data-delay="2"],
  .js-enabled [data-reveal][data-delay="3"] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .countdown-bar::before {
    animation: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}