/* ============================================================
   欧宝体育 · 中国官方主站 /assets/site.css
   共享外壳：reset、变量、中文排版、页头、页脚、通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.25rem);
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; }

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

button { font: inherit; color: inherit; }

a { color: inherit; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #07111F;
  --ink-2: #0C1B2E;
  --cyan: #19E3D1;
  --cyan-soft: #7FE8DD;
  --flame: #FF4D2E;
  --paper: #F3EDE2;
  --paper-white: #FBF8F2;
  --graphite: #111418;
  --steel: #8A99A8;
  --teal-deep: #0E6F6A;

  --font-head: 'Arial Black', 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'Roboto Mono', 'SFMono-Regular', Consolas, monospace;

  --wrap: 1240px;
  --gutter: clamp(1rem, 4vw, 3.25rem);
  --header-h: 78px;

  --line-cyan: rgba(25, 227, 209, .26);
  --line-soft: rgba(127, 232, 221, .16);
  --shadow-hard: 6px 6px 0 var(--ink-2);
  --shadow-cyan: 6px 6px 0 rgba(25, 227, 209, .32);
}

/* ---------- 3. 基础排版 ---------- */
body {
  padding-top: var(--header-h);
  background: var(--ink);
  color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
}

h1 { font-size: clamp(2.2rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.55rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }

p { max-width: 74ch; }

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

strong, b { font-weight: 700; }

::selection {
  background: var(--cyan);
  color: #04121f;
}

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

#main-content:focus { outline: none; }

/* ---------- 4. 跳转链 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: 1rem;
  z-index: 400;
  display: inline-block;
  padding: .68rem 1.05rem;
  background: var(--cyan);
  color: #04121f;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--flame);
  transition: top .2s ease;
}

.skip-link:focus {
  top: .55rem;
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  background: linear-gradient(180deg, rgba(7, 17, 31, .95) 0%, rgba(7, 17, 31, .58) 100%);
  border-bottom: 1px solid transparent;
  transition: background .32s ease, border-color .32s ease, box-shadow .32s ease;
}

.site-header.is-scrolled {
  background: var(--ink-2);
  border-bottom-color: var(--line-cyan);
  box-shadow: 0 12px 32px rgba(3, 9, 16, .55);
}

.header-inner {
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(.75rem, 2vw, 1.75rem);
}

.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--flame) 100%);
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: left center;
  pointer-events: none;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  flex: 0 0 auto;
  padding-block: .4rem;
  text-decoration: none;
  color: var(--paper-white);
}

.brand-badge {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--cyan);
  color: #04121f;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  transform: skewX(-9deg);
  box-shadow: 3px 3px 0 var(--flame);
  transition: transform .2s ease, box-shadow .2s ease;
}

.brand:hover .brand-badge {
  transform: skewX(-9deg) translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--flame);
}

.brand-text { display: block; line-height: 1.15; }

.brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--paper-white);
}

.brand-sub {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: .6rem;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan-soft);
}

/* 主导航 */
.nav {
  display: flex;
  align-items: center;
  gap: clamp(.5rem, 1.4vw, 1.4rem);
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(.35rem, 1.1vw, 1.05rem);
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: .5rem .15rem;
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: .01em;
  white-space: nowrap;
  color: #c6d3e0;
  text-decoration: none;
  transition: color .2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .26s cubic-bezier(.2, .7, .2, 1);
}

.nav-link:hover,
.nav-link:focus-visible { color: #ffffff; }

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

.nav-link[aria-current="page"] {
  color: #ffffff;
  font-weight: 700;
}

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

/* 页头行动区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-left: .5rem;
  padding-left: .9rem;
  border-left: 1px solid var(--line-cyan);
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .62rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .18s ease, box-shadow .18s ease;
}

.btn:hover { transform: translate(-1px, -1px); }

.btn-ghost {
  border-color: rgba(25, 227, 209, .55);
  background: transparent;
  color: var(--cyan-soft);
}

.btn-ghost:hover {
  background: rgba(25, 227, 209, .14);
  color: #ffffff;
}

.btn-accent {
  background: var(--flame);
  color: #1a0703;
  font-weight: 800;
  box-shadow: 4px 4px 0 rgba(25, 227, 209, .38);
}

.btn-accent:hover {
  background: #ff6a4f;
  box-shadow: 5px 5px 0 rgba(25, 227, 209, .5);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  padding: .5rem .72rem;
  border: 1px solid var(--line-cyan);
  border-radius: 0;
  background: transparent;
  color: var(--cyan-soft);
  cursor: pointer;
}

.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .25s ease, opacity .2s ease;
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
}

.site-header[data-open] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

body.nav-open { overflow: hidden; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-top: clamp(2.25rem, 5vw, 4rem);
  background: var(--ink-2);
  color: #c3d1de;
  border-top: 3px solid var(--cyan);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(25, 227, 209, .055) 0 2px, transparent 2px 16px);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr) minmax(0, 1.2fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
}

.footer-claim {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 3.6vw, 2.9rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--paper-white);
  margin-bottom: .8rem;
  max-width: 16ch;
}

.footer-claim-mark { color: var(--cyan); }

.footer-sign {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--steel);
}

.footer-title {
  margin-bottom: 1rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-nav ul {
  display: grid;
  gap: .1rem;
  list-style: none;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .3rem 0;
  font-size: .95rem;
  color: #cfdae6;
  text-decoration: none;
  transition: color .2s ease, transform .2s ease;
}

.footer-link::before {
  content: "→";
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--cyan);
  opacity: .75;
  transition: transform .2s ease, opacity .2s ease;
}

.footer-link:hover {
  color: #ffffff;
  transform: translateX(2px);
}

.footer-link:hover::before {
  opacity: 1;
  transform: translateX(2px);
}

.footer-contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .45rem .6rem;
  padding-block: .38rem;
  border-bottom: 1px dashed rgba(138, 153, 168, .28);
  font-family: var(--font-mono);
  font-size: .8rem;
}

.footer-contact-key {
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--steel);
}

.footer-contact-val {
  color: #e6eef6;
  overflow-wrap: anywhere;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  padding: .28rem .58rem;
  border: 1px solid rgba(25, 227, 209, .45);
  border-radius: 0;
  background: transparent;
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.copy-btn:hover {
  background: rgba(25, 227, 209, .14);
  color: #ffffff;
}

.copy-btn[data-copied] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121f;
}

.footer-note {
  margin-top: .9rem;
  max-width: 36ch;
  font-size: .78rem;
  line-height: 1.7;
  color: var(--steel);
}

.footer-addr {
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  color: #9fb0c1;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  padding: 1.15rem 0 1.8rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--steel);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem 1.15rem;
  list-style: none;
}

.footer-legal a {
  color: #9fb0c1;
  text-decoration: none;
  transition: color .2s ease;
}

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

.footer-copy { margin: 0; color: var(--steel); }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2.25rem);
  bottom: clamp(1rem, 3vw, 2.25rem);
  z-index: 140;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: var(--flame);
  color: #140502;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(25, 227, 209, .55);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease, background .2s ease;
}

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

.to-top:hover { background: #ff6a4f; }

/* ---------- 7. 通用布局与组件 ---------- */
.wrap {
  width: min(100% - 2 * var(--gutter), var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(2.5rem, 6vw, 5rem); }
.section-tight { padding-block: clamp(1.5rem, 3.5vw, 2.75rem); }

.band-dark {
  background: var(--ink);
  color: var(--paper-white);
}

.band-navy {
  background: var(--ink-2);
  color: #dfe9f2;
}

.band-paper {
  background: var(--paper);
  color: var(--graphite);
}

.band-paper h1,
.band-paper h2,
.band-paper h3,
.band-paper h4 { color: var(--graphite); }

.band-paper a { color: #0b5470; }

.band-paper .eyebrow { color: var(--teal-deep); }

.band-paper .divider { background: linear-gradient(90deg, var(--teal-deep), rgba(14, 111, 106, 0) 70%); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: currentColor;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -.01em;
}

.tag {
  display: inline-block;
  padding: .18rem .55rem;
  background: var(--teal-deep);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  line-height: 1.6;
}

.tag-flame {
  background: var(--flame);
  color: #1a0703;
}

.tag-cyan {
  background: var(--cyan);
  color: #04121f;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 2rem);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(1.5rem, 4vw, 3rem);
  background: linear-gradient(90deg, var(--cyan), rgba(25, 227, 209, 0) 70%);
}

.breadcrumbs {
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--steel);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  list-style: none;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: .45rem;
  color: var(--cyan);
}

.breadcrumbs a {
  color: #a9bacb;
  text-decoration: none;
}

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

.prose {
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.78;
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }

.prose ul,
.prose ol {
  padding-left: 1.4rem;
  margin-block: .8em;
}

.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-block: .35em; }

.prose blockquote {
  margin-block: 1.4em;
  padding: .2rem 0 .2rem 1.15rem;
  border-left: 3px solid var(--cyan);
  color: inherit;
}

/* 图片容器基础规则 */
.media {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line-cyan);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(7, 17, 31, .32) 0 8px, transparent 8px 18px);
  pointer-events: none;
}

.media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-wide { aspect-ratio: 16 / 9; }
.media-tall { aspect-ratio: 3 / 4; }
.media-square { aspect-ratio: 1 / 1; }

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1120px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 130;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1.25rem;
    margin-left: 0;
    padding: clamp(1.25rem, 5vw, 2.5rem) var(--gutter) clamp(2rem, 8vw, 3rem);
    background:
      radial-gradient(120% 80% at 100% 0%, rgba(25, 227, 209, .13) 0%, rgba(25, 227, 209, 0) 62%),
      linear-gradient(165deg, var(--ink) 0%, var(--ink-2) 100%);
    border-top: 1px solid var(--line-cyan);
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(101%);
    visibility: hidden;
    transition: transform .38s cubic-bezier(.2, .7, .2, 1), visibility .38s;
  }

  .site-header[data-open] .nav {
    transform: none;
    visibility: visible;
  }

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

  .nav-list > li {
    counter-increment: navIndex;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link {
    display: flex;
    align-items: baseline;
    gap: .85rem;
    padding: .95rem .25rem;
    font-size: 1.02rem;
    color: #d5e2ee;
  }

  .nav-link::before {
    content: "0" counter(navIndex);
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .1em;
    color: var(--cyan);
    opacity: .8;
  }

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

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

  .nav-link[aria-current="page"]::before {
    color: var(--flame);
    opacity: 1;
  }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: .65rem;
    margin: 0;
    padding: 0;
    border-left: 0;
  }

  .nav-actions .btn {
    width: 100%;
    padding: .9rem 1rem;
    font-size: .95rem;
  }

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

@media (max-width: 900px) {
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  :root {
    --header-h: 66px;
    --gutter: 1.15rem;
  }

  body { font-size: 15.5px; }

  .brand-badge {
    width: 34px;
    height: 34px;
    font-size: .72rem;
  }

  .brand-name { font-size: .95rem; }

  .brand-sub {
    font-size: .54rem;
    letter-spacing: .16em;
  }

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

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

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

  .to-top {
    width: 44px;
    height: 44px;
  }
}

/* ---------- 9. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .brand:hover .brand-badge,
  .footer-link:hover { transform: none; }
}