/* ============================================================
   BSPORTS 必一体育 — 全站共享样式 /assets/site.css
   赛博斜切体育数据杂志：变量、重置、头部、页脚、通用组件
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --bg-void: #0C0D12;
  --bg-panel: #151821;
  --paper: #F4F2EC;
  --text-high: #F5F7FA;
  --text-mid: #9CA3AF;
  --text-low: #6B7280;
  --accent-core: #C8FF00;
  --accent-violet: #6A5CFF;
  --stroke-fine: rgba(255,255,255,0.14);
  --shadow-deep: rgba(0,0,0,0.55);
  --focus-ring: #FFD83D;

  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --container-max: 1180px;
  --radius: 4px;
  --header-z: 100;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: dark; scrollbar-color: var(--accent-violet) var(--bg-void); scrollbar-width: thin; }
body { min-height: 100vh; margin: 0; background: var(--bg-void); color: var(--text-high); font-family: var(--font-body); font-size: 1rem; line-height: 1.6; -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; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; }
a { color: inherit; }
button { background: none; border: 0; cursor: pointer; padding: 0; }
::selection { background: var(--accent-core); color: var(--bg-void); }

/* ---------- 3. 容器与工具 ---------- */
.container { width: 100%; max-width: var(--container-max); margin-inline: auto; padding-inline: 20px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.skip-link { position: fixed; top: -72px; left: 16px; z-index: 300; display: inline-flex; align-items: center; min-height: 44px; padding: 10px 20px; font-size: 0.875rem; font-weight: 700; color: var(--bg-void); background: var(--accent-core); text-decoration: none; border-radius: 0 0 6px 6px; box-shadow: 0 6px 18px rgba(0,0,0,0.45); transition: top 0.2s ease-out; }
.skip-link:focus { top: 0; }

#main-content { min-height: 62vh; scroll-margin-top: 24px; }

/* ---------- 4. 焦点可见 ---------- */
:focus-visible { outline: 2px dashed var(--focus-ring); outline-offset: 3px; }
:focus:not(:focus-visible) { outline: none; }

/* ---------- 5. 通用按钮 ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 24px; font-family: var(--font-body); font-size: 0.9375rem; font-weight: 700; line-height: 1.2; color: var(--text-high); background: transparent; border: 1px solid var(--stroke-fine); border-radius: var(--radius); text-decoration: none; cursor: pointer; transition: background-color 0.2s ease-out, border-color 0.2s ease-out, color 0.2s ease-out, transform 0.2s ease-out; }
.btn:hover { border-color: var(--accent-core); color: var(--accent-core); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--accent { background: var(--accent-core); border-color: var(--accent-core); color: var(--bg-void); font-weight: 800; }
.btn--accent:hover { background: var(--accent-violet); border-color: var(--accent-violet); color: var(--paper); transform: translateY(-1px); }
.btn--ghost { border-color: var(--stroke-fine); }
.btn--ghost:hover { background: rgba(200,255,0,0.06); }

/* ---------- 6. 面包屑 ---------- */
.breadcrumb { padding: 18px 0 4px; }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; list-style: none; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; font-size: 0.8125rem; color: var(--text-mid); }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; font-family: var(--font-mono); color: var(--text-low); }
.breadcrumb__link { color: var(--text-mid); text-decoration: none; transition: color 0.2s ease-out; }
.breadcrumb__link:hover { color: var(--accent-core); }
.breadcrumb__item[aria-current="page"] { color: var(--text-high); font-weight: 500; }

/* ---------- 7. 章节与面板 ---------- */
.section { padding: clamp(2.5rem, 6vw, 4.5rem) 0; }
.section--tight { padding: 1.5rem 0; }
.section--paper { background: var(--paper); }

.section-heading { display: flex; align-items: baseline; flex-wrap: wrap; gap: 16px; margin-bottom: 28px; }
.section-heading__index { font-family: var(--font-mono); font-size: 0.8125rem; font-weight: 400; letter-spacing: 0.18em; color: var(--accent-violet); }
.section-heading__title { font-size: clamp(1.75rem, 3.2vw, 2.5rem); font-weight: 900; line-height: 1.15; letter-spacing: -0.015em; color: var(--text-high); }
.section-heading__desc { width: 100%; max-width: 56ch; font-size: 0.9375rem; color: var(--text-mid); }
.section--paper .section-heading__title { color: #17181C; }
.section--paper .section-heading__desc { color: #4B5563; }

.panel { position: relative; background: var(--bg-panel); border: 1px solid var(--stroke-fine); border-radius: var(--radius); box-shadow: 0 12px 32px var(--shadow-deep); padding: clamp(20px, 3vw, 32px); }
.panel--translucent { background: rgba(21,24,33,0.72); }
.panel--paper { background: var(--paper); border-color: rgba(0,0,0,0.12); color: #17181C; }
.panel__title { font-size: 1.375rem; font-weight: 700; line-height: 1.3; letter-spacing: -0.01em; color: var(--text-high); margin-bottom: 12px; }
.panel--paper .panel__title { color: #17181C; }
.panel__body { font-size: 0.9375rem; line-height: 1.7; color: var(--text-mid); }
.panel--paper .panel__body { color: #3A3D45; }

/* ---------- 8. 栅格 ---------- */
.grid { display: grid; gap: clamp(16px, 2.4vw, 24px); }
.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)); }

/* ---------- 9. 图片容器 ---------- */
.media { position: relative; display: block; overflow: hidden; background: var(--bg-panel); border: 1px solid var(--stroke-fine); border-radius: var(--radius); }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media img { width: 100%; height: 100%; object-fit: cover; }

/* ---------- 10. 页头 ---------- */
.site-header { position: sticky; top: 0; z-index: var(--header-z); background: linear-gradient(180deg, rgba(200,255,0,0.03), transparent 64%), rgba(12,13,18,0.92); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-bottom: 1px solid var(--stroke-fine); }

.site-progress { position: absolute; top: 0; left: 0; display: block; width: 100%; height: 2px; z-index: 15; background: transparent; transform: scaleX(0); transform-origin: 0 50%; pointer-events: none; }
.site-progress::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--accent-core) 0 55%, var(--accent-violet) 55% 100%); opacity: 0.85; }

.site-header__util { border-bottom: 1px solid rgba(255,255,255,0.08); background: rgba(255,255,255,0.02); }
.site-header__util-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 28px; }
.site-header__util-item { font-size: 0.6875rem; letter-spacing: 0.08em; color: var(--text-low); }
.site-header__util-item--mono { font-family: var(--font-mono); letter-spacing: 0.04em; }

.site-header__masthead { position: relative; display: flex; align-items: center; gap: 16px; padding: 14px 0 12px; }
.site-header__masthead::after { content: ""; position: absolute; right: 0; bottom: -1px; width: min(160px, 30%); height: 1px; background: linear-gradient(90deg, transparent, var(--accent-violet)); }

.site-header__brand { display: inline-flex; align-items: center; gap: 14px; margin-right: auto; text-decoration: none; color: var(--paper); }
.site-header__mark { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; flex-shrink: 0; font-family: var(--font-mono); font-size: 1.1875rem; font-weight: 800; color: var(--bg-void); background: linear-gradient(135deg, var(--accent-core), var(--accent-violet)); clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%); box-shadow: 0 0 20px rgba(200,255,0,0.22); }
.site-header__text { display: flex; flex-direction: column; }
.site-header__name { font-size: clamp(1.375rem, 3vw, 2.125rem); font-weight: 900; line-height: 1.12; letter-spacing: -0.01em; color: var(--paper); white-space: nowrap; }
.site-header__sub { margin-top: 3px; font-family: var(--font-mono); font-size: 0.6875rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--text-mid); white-space: nowrap; }
.site-header__tag { padding: 6px 14px; font-family: var(--font-mono); font-size: 0.6875rem; letter-spacing: 0.32em; color: var(--accent-core); border: 1px solid rgba(200,255,0,0.4); transform: skewX(-12deg); white-space: nowrap; }

/* ---------- 11. 主导航 ---------- */
.nav-toggle { display: none; }

.site-nav { display: flex; align-items: center; gap: 12px; border-top: 1px solid var(--stroke-fine); }
.site-nav__list { display: flex; align-items: center; justify-content: center; flex: 1; gap: 2px; list-style: none; }
.site-nav__item { margin: 0; }
.site-nav__link { position: relative; display: inline-flex; align-items: baseline; gap: 8px; min-height: 44px; padding: 12px 14px; font-size: 0.9375rem; font-weight: 500; color: var(--text-high); text-decoration: none; transition: color 0.2s ease-out; }
.site-nav__link::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px; height: 2px; background: var(--accent-core); transform: scaleX(0) skewX(-18deg); transform-origin: 0 50%; transition: transform 0.22s ease-out; }
.site-nav__link:hover, .site-nav__link[aria-current="page"] { color: var(--accent-core); }
.site-nav__link:hover::after, .site-nav__link[aria-current="page"]::after { transform: scaleX(1) skewX(-18deg); }
.site-nav__index { font-family: var(--font-mono); font-size: 0.65625rem; font-weight: 400; color: var(--text-low); transition: color 0.2s ease-out; }
.site-nav__link:hover .site-nav__index, .site-nav__link[aria-current="page"] .site-nav__index { color: var(--accent-violet); }
.site-nav__label { white-space: nowrap; }

.site-header__cta { position: relative; overflow: hidden; flex-shrink: 0; }
.site-header__cta::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(-45deg, rgba(12,13,18,0.14) 0 6px, transparent 6px 12px); opacity: 0; transition: opacity 0.2s ease-out; pointer-events: none; }
.site-header__cta:hover::before { opacity: 1; }

/* ---------- 12. 页脚 ---------- */
.site-footer { position: relative; background: linear-gradient(180deg, rgba(106,92,255,0.05), transparent 160px), var(--bg-void); border-top: 1px solid var(--stroke-fine); margin-top: 48px; }
.site-footer::before { content: ""; position: absolute; top: -1px; left: 0; width: min(420px, 100%); height: 2px; background: linear-gradient(90deg, var(--accent-core), var(--accent-violet)); z-index: 1; }

.site-footer__top { display: grid; grid-template-columns: 1.5fr 0.9fr 1.2fr; gap: clamp(24px, 4vw, 48px); padding: clamp(32px, 5vw, 56px) 0 40px; }

.site-footer__brand { position: relative; padding-left: 18px; border-left: 1px solid var(--accent-violet); }
.site-footer__name { font-size: clamp(1.5rem, 3vw, 2.125rem); font-weight: 900; line-height: 1.1; letter-spacing: -0.01em; color: var(--paper); margin-bottom: 8px; }
.site-footer__sub { font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-core); margin-bottom: 18px; }
.site-footer__statement { max-width: 46ch; font-size: 0.9375rem; line-height: 1.7; color: var(--text-mid); }

.site-footer__heading { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500; letter-spacing: 0.22em; text-transform: uppercase; color: var(--text-mid); }
.site-footer__heading::before { content: ""; width: 18px; height: 2px; background: var(--accent-violet); display: inline-block; }

.site-footer__list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.site-footer__list a { display: inline-flex; align-items: center; gap: 8px; min-height: 36px; padding: 4px 0; font-size: 0.9375rem; color: var(--text-mid); text-decoration: none; transition: color 0.2s ease-out, transform 0.2s ease-out; }
.site-footer__list a::before { content: "→"; font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent-violet); opacity: 0; transform: translateX(-4px); transition: opacity 0.2s ease-out, transform 0.2s ease-out; }
.site-footer__list a:hover { color: var(--text-high); transform: translateX(4px); }
.site-footer__list a:hover::before { opacity: 1; transform: translateX(0); }
.site-footer__list a[aria-current="page"] { color: var(--accent-core); }

.site-footer__contact { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.site-footer__contact-item { font-size: 0.875rem; line-height: 1.5; color: var(--text-mid); }
.site-footer__contact-item--strong { font-family: var(--font-mono); font-weight: 600; color: var(--text-high); }
.site-footer__contact-item--note { font-size: 0.8125rem; color: var(--text-low); }

.site-footer__bottom { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; padding: 18px 0; border-top: 1px solid var(--stroke-fine); }
.site-footer__legal { display: flex; gap: 20px; list-style: none; }
.site-footer__legal a { font-size: 0.8125rem; color: var(--text-mid); text-decoration: none; transition: color 0.2s ease-out; }
.site-footer__legal a:hover { color: var(--accent-core); }
.site-footer__copyright { font-size: 0.8125rem; color: var(--text-low); }
.site-footer__icp { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-low); }

/* ---------- 13. 滚动显现 ---------- */
.js-ready [data-reveal] { opacity: 0; transform: translate3d(0, 28px, 0); transition: opacity 0.5s ease-out, transform 0.5s ease-out; }
.js-ready [data-reveal][data-revealed="true"] { opacity: 1; transform: translate3d(0, 0, 0); }
.js-ready [data-reveal-stagger] [data-reveal] { transition-duration: 0.42s; }

/* ---------- 14. 平板与手机 ---------- */
@media (max-width: 899px) {
  .site-header__util-item--mono { display: none; }

  .site-header__masthead { flex-wrap: wrap; }
  .site-header__tag { display: none; }

  .nav-toggle { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; width: 44px; height: 44px; margin-left: 4px; padding: 10px 8px; background: transparent; border: 1px solid var(--stroke-fine); border-radius: var(--radius); }
  .nav-toggle__bar { display: block; width: 22px; height: 2px; background: var(--text-high); transition: transform 0.25s ease-out, opacity 0.25s ease-out; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .site-nav { display: grid; grid-template-rows: 0fr; gap: 0; border-top: 1px solid transparent; transition: grid-template-rows 0.3s ease-out, border-color 0.3s ease-out; }
  .site-nav[data-open] { grid-template-rows: 1fr; border-top-color: var(--stroke-fine); }
  .site-nav__list, .site-header__cta { min-height: 0; overflow: hidden; visibility: hidden; transition: visibility 0s linear 0.3s; }
  .site-nav[data-open] .site-nav__list, .site-nav[data-open] .site-header__cta { visibility: visible; transition-delay: 0s; }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__link { justify-content: flex-start; border-bottom: 1px solid rgba(255,255,255,0.05); }
  .site-nav__link::after { display: none; }
  .site-header__cta { width: 100%; margin: 8px 0 12px; border-radius: 0; padding-top: 12px; padding-bottom: 12px; }

  .site-footer__top { grid-template-columns: 1fr; gap: 32px; padding: 36px 0 28px; }
}

@media (max-width: 599px) {
  .container { padding-inline: 16px; }
  .site-header__util-inner { justify-content: center; }
  .site-header__name { font-size: clamp(1.25rem, 4.6vw, 2rem); }
  .site-header__mark { width: 36px; height: 36px; font-size: 1rem; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 600px) and (max-width: 899px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 15. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
  .site-progress { display: none; }
  .js-ready [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
}