/* ==========================================================================
   贝博艾弗森体育 — /assets/site.css
   共享外壳：框架式导航 · 左右分屏基座 · 战术板色阶与基础组件
   ========================================================================== */

:root {
  /* 色彩：墨绿基底 + 炭黑分区 + 单一抬升面板 */
  --ink: #0B1F1A;
  --ink-2: #101314;
  --panel: #16211E;
  --panel-2: #1A2724;
  --line: #2E4A43;
  --line-soft: rgba(46, 74, 67, .58);

  --fg: #E8F1EE;
  --fg-dim: #9FB3AD;

  --cyan: #35F2C8;
  --orange: #FF7A2F;
  --violet: #7C5CFF;
  --gold: #F5C542;

  /* 字体：编辑感衬线 / 粗重无衬线 / 等宽字段 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia,
                "Times New Roman", serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
               "Liberation Mono", "Courier New", monospace;

  /* 节奏 */
  --shell: 1400px;
  --gutter: clamp(18px, 4.2vw, 56px);
  --gap: clamp(16px, 2vw, 28px);
  --radius: 2px;

  --dur: 180ms;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
  word-break: break-word;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.015em;
}

p { margin: 0; }

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

main { display: block; }

#main-content { scroll-margin-top: 112px; }

::selection {
  background: var(--cyan);
  color: #052A22;
}

/* ---------------------------------------------------------- focus ring -- */
:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ------------------------------------------------------------ layout --- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--split-r { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 18px;
  height: 1px;
  background: var(--cyan);
}

/* ================================================================ header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 31, 26, .94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.site-header[data-open] { border-bottom-color: var(--orange); }

.header-frame {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  border-left: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
}

/* 状态条：框架的上缘刻度 */
.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 32px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fg-dim);
  white-space: nowrap;
  overflow: hidden;
}

.header-status__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 242, 200, .16);
  animation: statusPulse 2.6s var(--ease) infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .42; }
}

.header-status__text { color: var(--cyan); }

.header-status__sep {
  flex: none;
  width: 1px;
  height: 12px;
  background: var(--line);
}

.header-status__meta { color: var(--fg-dim); }

.header-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 66px;
}

/* 品牌字标 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
  padding: 6px 0;
}

.brand__mark {
  flex: none;
  width: 22px;
  height: 22px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.brand:hover .brand__mark { background: var(--orange); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--fg);
}

.brand__sub {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--fg-dim);
  text-transform: uppercase;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(16, 19, 20, .6);
  color: var(--fg-dim);
  font-size: 13px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--cyan);
  color: var(--fg);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* 主导航条：以极细边框围合 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-nav__list {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--line);
  background: rgba(16, 19, 20, .55);
  border-radius: var(--radius);
}

.site-nav__item + .site-nav__item { border-left: 1px solid var(--line); }

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--fg-dim);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__link:hover {
  color: var(--fg);
  background: rgba(53, 242, 200, .06);
}

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

.site-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(53, 242, 200, .1);
}

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

/* 滚动进度：贴住框架下缘 */
.progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  pointer-events: none;
  transition: width 120ms linear;
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 0;
  z-index: 120;
  transform: translateY(-140%);
  padding: 10px 18px;
  background: var(--cyan);
  color: #052A22;
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ================================================================ footer */
.site-footer {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  color: var(--fg-dim);
  font-size: 14px;
}

.footer-frame {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) var(--gutter) 26px;
  border-left: 1px solid var(--line-soft);
  border-right: 1px solid var(--line-soft);
}

.footer-intro {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 32px;
  padding-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--fg);
  transition: color var(--dur) var(--ease);
}

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

.footer-intro__note {
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg-dim);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
  padding-block: clamp(28px, 4vw, 46px);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--fg);
}

.footer-col__title::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  background: var(--cyan);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  font-size: 14px;
}

.footer-list__item {
  line-height: 1.6;
  color: var(--fg-dim);
}

.footer-list__key {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer-list--contact .footer-list__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.footer-list--contact .footer-list__key { margin: 0; }

.footer-list__note {
  display: block;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--fg-dim);
  opacity: .85;
}

.footer-list--contact .footer-list__note { grid-template-columns: 1fr; }

.footer-link {
  color: var(--fg);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--orange);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--fg-dim);
}

.footer-base__stamp {
  margin-left: auto;
  color: var(--cyan);
}

/* ============================================================ components */
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--fg);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.btn--accent {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04241D;
  font-weight: 700;
}

.btn--accent:hover {
  background: #5BFFDD;
  border-color: #5BFFDD;
  color: #04211A;
}

.btn--ghost { background: transparent; }

.nav-cta { flex: none; }

/* 面板与卡片 */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 28px);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.2vw, 26px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--panel-2);
}

/* 数据数字 */
.num {
  font-family: var(--font-sans);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.045em;
  line-height: .9;
  color: var(--cyan);
}

.num--lg { font-size: clamp(48px, 7vw, 104px); }
.num--xl { font-size: clamp(64px, 11vw, 160px); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--fg-dim);
  background: rgba(22, 33, 30, .72);
  border: 1px solid var(--line);
  border-radius: 1px;
}

.tag--cyan { color: var(--cyan); border-color: rgba(53, 242, 200, .45); }
.tag--orange { color: var(--orange); border-color: rgba(255, 122, 47, .45); }
.tag--gold { color: var(--gold); border-color: rgba(245, 197, 66, .45); }

/* 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--fg-dim);
}

.breadcrumbs a {
  color: var(--fg-dim);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.breadcrumbs__sep { color: var(--line); }

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

/* 图片容器基础规则 */
.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--4x3 { aspect-ratio: 4 / 3; }
.figure--1x1 { aspect-ratio: 1 / 1; }
.figure--tall { aspect-ratio: 3 / 4; }

.figure__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--fg-dim);
  background: linear-gradient(180deg, rgba(11, 31, 26, 0), rgba(11, 31, 26, .94));
}

/* 6 度倾角切割 */
.slant { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), 0 100%); }
.slant--rev { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px)); }
.slant--top { clip-path: polygon(0 30px, 100% 0, 100% 100%, 0 100%); }

/* 进入视口显现（仅在 JS 可用时隐藏初始状态） */
:root.js [data-reveal] {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

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

/* ============================================================ responsive */
@media (max-width: 1120px) {
  .site-nav__link { padding: 10px 12px; font-size: 13px; }
  .nav-cta { padding: 9px 15px; font-size: 13px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    background: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 6px 0 18px;
    max-height: calc(100dvh - 128px);
    overflow-y: auto;
    z-index: 90;
  }

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

  .site-nav__list {
    flex-direction: column;
    border: 0;
    background: transparent;
    border-radius: 0;
  }

  .site-nav__item + .site-nav__item {
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .site-nav__link {
    padding: 15px var(--gutter);
    font-size: 15px;
    color: var(--fg);
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    background: rgba(53, 242, 200, .08);
    box-shadow: inset 3px 0 0 var(--orange);
  }

  .nav-cta {
    margin: 16px var(--gutter) 0;
    padding: 13px 20px;
    font-size: 14px;
  }

  .grid--12,
  .grid--2,
  .grid--3,
  .grid--split,
  .grid--split-r { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .header-status { font-size: 10px; letter-spacing: .1em; gap: 8px; }

  .header-status__meta--wide { display: none; }

  .header-bar { min-height: 60px; }

  .brand__name { font-size: 17px; }
  .brand__sub { font-size: 9px; letter-spacing: .14em; }

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

  .footer-base { font-size: 11px; }
  .footer-base__stamp { margin-left: 0; }
}

@media (max-width: 460px) {
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 10px 12px; }
}

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

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

  .header-status__dot { animation: none; }

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

  .btn:hover,
  .card:hover,
  .card:focus-within { transform: none; }
}