/* =========================================================
   必一体育 / assets/site.css
   共享层：reset、变量、中文排版、报头、页脚、按钮、面包屑、网格、媒体容器
   ========================================================= */

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

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

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

ol, ul { list-style: none; }

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

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

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

table { border-collapse: collapse; }

hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 夜色与山地墨绿 */
  --ink-900: #05100B;
  --ink-800: #08160F;
  --ink-700: #0E2118;
  --ink-600: #142C20;
  --ink-500: #1C3A2A;

  /* 竞技红 */
  --red: #E23A2E;
  --red-deep: #A2211A;
  --red-soft: #FF7A6B;

  /* 荧光青高亮 */
  --cyan: #3EF0C0;
  --cyan-dim: #1C8C71;

  /* 喀斯特石灰白 */
  --stone: #F1EEE6;
  --stone-2: #CFCBBE;
  --muted: #8CA396;

  /* 边界 */
  --line: rgba(241, 238, 230, 0.16);
  --line-strong: rgba(241, 238, 230, 0.36);

  /* 字体 */
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 尺寸 */
  --wrap: 1200px;
  --wrap-narrow: 760px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --head-h: 0px;

  /* 粗野主义硬阴影 */
  --shadow-hard: 6px 6px 0 0 var(--red);
  --shadow-soft: 6px 6px 0 0 var(--cyan);

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
html, body { min-height: 100%; }

body {
  margin: 0;
  color: var(--stone);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 78% at 10% -12%, rgba(62, 240, 192, 0.10), transparent 58%),
    radial-gradient(92% 66% at 102% 0%, rgba(226, 58, 46, 0.18), transparent 52%),
    linear-gradient(180deg, #05100B 0%, #07150E 52%, #04100A 100%);
  background-attachment: fixed;
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.72;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.is-nav-open { overflow: hidden; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.015em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

p + p { margin-top: 0.85em; }

strong, b { font-weight: 800; color: #fff; }

small { font-size: 0.82em; }

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

#main-content { display: block; scroll-margin-top: 7rem; }

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

/* ---------- 4. 通用排版工具 ---------- */
.h1 {
  font-size: clamp(2.05rem, 5.4vw, 3.9rem);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing 0.01em;
}

.h2 {
  font-size: clamp(1.45rem, 2.9vw, 2.15rem);
  font-weight: 800;
  line-height: 1.12;
}

.lede {
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  color: var(--stone-2);
  max-width: 64ch;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--red-soft);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  font-feature-settings: "tnum" 1;
}

/* ---------- 5. 容器与章节 ---------- */
.wrap,
.head-frame,
.foot-frame,
.wrap--narrow {
  width: min(calc(100% - 2 * var(--gutter)), var(--wrap));
  margin-inline: auto;
}

.wrap--narrow { width: min(calc(100% - 2 * var(--gutter)), var(--wrap-narrow)); }

.section { padding-block: clamp(2rem, 5vw, 4.2rem); }

.page-head {
  padding-block: clamp(1.6rem, 4vw, 3.2rem);
  border-bottom: 2px solid var(--line-strong);
}

/* ---------- 6. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.7rem);
}

.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)); }
.grid--asym { grid-template-columns: 1.42fr 1fr; align-items: start; }

@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
}

/* ---------- 7. 通用组件：卡片 / 标签 / 展区 ---------- */
.card {
  position: relative;
  padding: clamp(1rem, 2.2vw, 1.65rem);
  border: 2px solid var(--line-strong);
  background: linear-gradient(158deg, rgba(28, 58, 42, 0.58), rgba(6, 19, 13, 0.82));
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.card:hover {
  border-color: var(--cyan);
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-soft);
}

.card::after {
  content: "";
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 26px;
  height: 26px;
  background: var(--red);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.28rem 0.55rem;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  background: rgba(62, 240, 192, 0.06);
}

.slab {
  border: 2px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(20, 44, 32, 0.72), rgba(5, 16, 11, 0.86));
  padding: clamp(1.1rem, 2.6vw, 2.1rem);
}

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

.slab--red .tag { color: #fff; border-color: rgba(255, 255, 255, 0.5); background: rgba(255, 255, 255, 0.12); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  line-height: 1;
  padding: 0.85rem 1.4rem;
  border: 2px solid var(--stone);
  color: var(--stone);
  background: transparent;
  transition: transform 0.16s var(--ease), box-shadow 0.16s var(--ease),
              background-color 0.16s var(--ease), color 0.16s var(--ease),
              border-color 0.16s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-soft);
}

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

.btn--primary:hover,
.btn--primary:focus-visible { box-shadow: 4px 4px 0 0 var(--cyan); }

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--stone);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--sm {
  font-size: 0.79rem;
  padding: 0.58rem 0.95rem;
  letter-spacing: 0.1em;
}

/* ---------- 9. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  padding-block: 1rem 0;
}

.crumbs li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.crumbs li + li::before {
  content: "/";
  color: var(--red);
}

.crumbs a { transition: color 0.16s var(--ease); }
.crumbs a:hover { color: var(--cyan); }
.crumbs [aria-current="page"] { color: var(--stone); }

/* ---------- 10. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-strong);
  background:
    repeating-linear-gradient(135deg, rgba(62, 240, 192, 0.06) 0 10px, transparent 10px 20px),
    linear-gradient(140deg, #0E2318, #061410);
  aspect-ratio: 4 / 3;
  width: 100%;
}

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

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

.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 0.36rem 0.75rem;
  background: rgba(5, 16, 11, 0.92);
  border-top: 2px solid var(--red);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--stone-2);
}

/* ---------- 11. 显现（页面阶段给区块加 data-reveal） ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

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

/* =========================================================
   12. 刊头
   ========================================================= */
.site-head {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 16, 11, 0.94);
  border-bottom: 2px solid var(--line-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.head-frame { position: relative; }

.skip-link {
  position: absolute;
  left: 50%;
  top: 0.45rem;
  transform: translate(-50%, -240%);
  z-index: 90;
  padding: 0.6rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  background: var(--cyan);
  color: var(--ink-900);
  border: 2px solid var(--ink-900);
  transition: transform 0.18s var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* 报头三栏 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: clamp(0.72rem, 1.6vw, 1.1rem) 0 clamp(0.5rem, 1.2vw, 0.8rem);
}

.masthead__meta {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  justify-self: start;
  max-width: 22ch;
  line-height: 1.5;
}

.masthead__aside {
  justify-self: end;
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  justify-self: center;
  transition: transform 0.16s var(--ease);
}

.brand:hover { transform: translateY(-2px); }

.brand__mark {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  line-height: 1;
  padding: 0.34rem 0.45rem;
  color: #fff;
  background: var(--red);
  border: 2px solid var(--red);
}

.brand__word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.28rem, 2.6vw, 1.95rem);
  letter-spacing: 0.1em;
  line-height: 1;
  white-space: nowrap;
}

/* 折叠按钮 */
.nav-toggle {
  display: none;
  position: absolute;
  top: 0.5rem;
  right: 0;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.72rem;
  border: 2px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--stone);
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), top 0.2s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 10px; }

.site-head[data-open] .nav-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.site-head[data-open] .nav-toggle__bars::after { top: 5px; transform: rotate(-45deg); }

/* 主导航 */
.site-nav {
  border-top: 1px solid var(--line);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.site-nav__item { display: flex; }

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.82rem clamp(0.7rem, 1.7vw, 1.5rem);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--stone-2);
  border-bottom: 3px solid transparent;
  border-left: 4px solid transparent;
  transition: color 0.16s var(--ease), background-color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  transition: color 0.16s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--cyan);
  background: rgba(62, 240, 192, 0.07);
  border-bottom-color: var(--cyan);
}

.site-nav__link:hover .site-nav__idx { color: var(--cyan); }

.site-nav__link[aria-current="page"] {
  color: var(--stone);
  background: rgba(226, 58, 46, 0.12);
  border-bottom-color: var(--red);
  border-left-color: var(--red);
}

.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--red-soft); }

/* 阅读进度条 */
.read-meter {
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 3px;
  width: var(--meter, 0%);
  background: linear-gradient(90deg, var(--red), var(--cyan));
  pointer-events: none;
}

/* ---------- 13. 页脚 ---------- */
.site-foot {
  margin-top: clamp(3rem, 8vw, 6.5rem);
  border-top: 2px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(8, 22, 15, 0.96), rgba(4, 14, 10, 1));
  color: var(--stone-2);
}

.foot-frame {
  padding-block: clamp(2.1rem, 4.4vw, 3.4rem) 1.5rem;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.5fr;
  gap: clamp(1.3rem, 3vw, 2.6rem);
  align-items: start;
}

.foot-col--brand {
  border-left: 4px solid var(--red);
  padding-left: clamp(0.8rem, 1.6vw, 1.2rem);
}

.foot-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: var(--stone);
}

.foot-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.95rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
}

.foot-list { font-size: 0.92rem; }
.foot-list li + li { margin-top: 0.5rem; }

.foot-list a {
  display: inline-block;
  color: var(--stone-2);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.foot-list a:hover,
.foot-list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.foot-list--plain { color: var(--stone-2); }
.foot-list--plain li { line-height: 1.6; }

.foot-key {
  display: inline-block;
  min-width: 3.4em;
  margin-right: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.foot-note {
  margin-top: 0.9rem;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 42ch;
}

.foot-note--sm { font-size: 0.8rem; line-height: 1.7; max-width: 40ch; }

.foot-cta { margin-top: 1.15rem; }

.foot-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem 1.5rem;
  margin-top: clamp(1.8rem, 4vw, 2.9rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  font-size: 0.79rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.foot-base__note { font-family: var(--font-mono); letter-spacing: 0.14em; }

/* =========================================================
   14. 响应式
   ========================================================= */
@media (max-width: 1024px) {
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-col--brand { border-left-width: 4px; }
}

@media (max-width: 899px) {
  body { font-size: 16px; }

  .masthead {
    grid-template-columns: 1fr;
    justify-items: center;
    padding-block: 0.72rem 0.6rem;
  }

  .masthead__meta,
  .masthead__aside { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: calc(var(--gutter) * -1);
    right: calc(var(--gutter) * -1);
    border-top: 2px solid var(--red);
    border-bottom: 2px solid var(--line-strong);
    background: #06120D;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.3s var(--ease), visibility 0.3s var(--ease);
  }

  .site-head[data-open] .site-nav {
    max-height: min(74vh, 560px);
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list { flex-direction: column; flex-wrap: nowrap; }

  .site-nav__item { display: block; }

  .site-nav__link {
    display: flex;
    width: 100%;
    padding: 0.95rem var(--gutter);
    border-bottom: 1px solid var(--line);
    border-left: 4px solid transparent;
    font-size: 1rem;
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: var(--line);
    background: rgba(226, 58, 46, 0.12);
  }

  .page-head { padding-block: 1.5rem 1.8rem; }
}

@media (max-width: 620px) {
  .foot-grid { grid-template-columns: 1fr; }
  .foot-col--brand { padding-left: 0.9rem; }
  .foot-base { flex-direction: column; align-items: flex-start; }
  .foot-base__note { letter-spacing: 0.1em; }
}

/* ---------- 15. 动效与可访问性 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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