/* ==========================================================================
   88体育官网 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 刊头导航 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 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, ul, ol, address, fieldset {
  margin: 0;
}

ul[class], ol[class] { padding: 0; list-style: none; }

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

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

a { color: inherit; }

hr { border: 0; border-top: 1px solid var(--grid-600); }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --ink-900: #0A1210;
  --charcoal-800: #14181A;
  --paper-100: #F1EFE6;
  --grid-600: #24322C;
  --signal-cyan: #35F0D0;
  --signal-orange: #FF8A3D;
  --sand-400: #C8B27C;
  --slate-500: #7C8FA3;
  --focus-violet: #8C7CFF;
  --teal-700: #123B33;

  /* 字体 */
  --font-display: "Arial Narrow", "HelveticaNeue-CondensedBold", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Roboto Mono", "Courier New", monospace;

  /* 字号阶梯 12 / 13 / 16 / 18 / 22 / 28 / 40 / 56 / 88 */
  --fs-12: 0.75rem;
  --fs-13: 0.8125rem;
  --fs-16: 1rem;
  --fs-18: 1.125rem;
  --fs-22: 1.375rem;
  --fs-28: 1.75rem;
  --fs-40: clamp(1.75rem, 3vw, 2.5rem);
  --fs-56: clamp(2.25rem, 4.4vw, 3.5rem);
  --fs-88: clamp(3rem, 7vw, 5.5rem);

  /* 尺寸与节奏 */
  --wrap-max: 1440px;
  --gutter: clamp(16px, 3vw, 40px);
  --line: 1px solid var(--grid-600);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.01em;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--fs-56); }
h2 { font-size: var(--fs-40); }
h3 { font-size: var(--fs-28); }
h4 { font-size: var(--fs-22); }

p { max-width: 38em; }

strong, b { font-weight: 700; color: var(--paper-100); }

a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  text-decoration-color: var(--grid-600);
  transition: color 200ms var(--ease), text-decoration-color 200ms var(--ease);
}

a:hover { color: var(--signal-cyan); text-decoration-color: var(--signal-cyan); }

::selection { background: var(--signal-cyan); color: var(--ink-900); }

:focus-visible {
  outline: 2px solid var(--focus-violet);
  outline-offset: 3px;
  border-radius: 0;
}

#main-content { display: block; }
#main-content:focus-visible { outline: 2px solid var(--focus-violet); outline-offset: 4px; }

/* ---------- 4. 跳至正文 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 999;
  transform: translate(-50%, -140%);
  padding: 12px 22px;
  background: var(--signal-cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  text-decoration: none;
  border: 1px solid var(--signal-cyan);
  transition: transform 200ms var(--ease);
}

.skip-link:focus-visible,
.skip-link:focus {
  transform: translate(-50%, 0);
  color: var(--ink-900);
  outline-offset: -4px;
}

/* ---------- 5. 容器与栅格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.wrap--narrow { max-width: 780px; }

.grid { display: grid; gap: 24px; align-items: start; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 6. 页头：信号线 + 刊头 ---------- */
.site-header {
  position: relative;
  z-index: 40;
  background-color: var(--charcoal-800);
  border-top: 3px solid var(--signal-cyan);
  border-bottom: 1px solid var(--grid-600);
}

.masthead {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(36, 50, 44, 0.55) 0 1px,
    transparent 1px 120px
  );
}

.masthead__grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px 32px;
  padding: 24px 0 20px;
}

.masthead__meta { justify-self: start; min-width: 0; }

/* 期号戳 */
.issue-badge {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 10px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.issue-badge__label {
  color: var(--slate-500);
}

.issue-badge__num {
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-cyan);
  font-variant-numeric: tabular-nums;
}

.issue-badge__unit { color: var(--sand-400); }

.issue-badge__state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 8px;
  border: 1px solid var(--grid-600);
  background: rgba(200, 178, 124, 0.06);
  color: var(--sand-400);
  letter-spacing: 0.06em;
  text-transform: none;
}

.issue-badge__state::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--signal-cyan);
  flex: none;
}

/* 品牌 */
.brand {
  justify-self: center;
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--paper-100);
  transition: color 200ms var(--ease);
}

.brand:hover { color: var(--paper-100); text-decoration: none; }

.brand__mark {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.4vw, 56px);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--paper-100);
  transition: color 200ms var(--ease);
}

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

.brand__words { display: grid; gap: 2px; }

.brand__name {
  font-size: var(--fs-18);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--slate-500);
  line-height: 1.2;
}

/* 右侧 */
.masthead__side {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.tagline {
  font-size: var(--fs-13);
  letter-spacing: 0.2em;
  color: var(--sand-400);
  white-space: nowrap;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: var(--fs-13);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 200ms var(--ease), color 200ms var(--ease),
              border-color 200ms var(--ease), transform 200ms var(--ease);
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--signal {
  background: var(--signal-orange);
  border-color: var(--signal-orange);
  color: #170F08;
}

.btn--signal:hover {
  background: #FFA463;
  border-color: #FFA463;
  color: #170F08;
}

.btn--ghost {
  background: transparent;
  border-color: var(--grid-600);
  color: var(--signal-cyan);
}

.btn--ghost:hover {
  background: rgba(53, 240, 208, 0.08);
  border-color: var(--signal-cyan);
  color: var(--signal-cyan);
}

.btn--sm { padding: 9px 14px; font-size: var(--fs-12); }
.btn--block { width: 100%; }

/* ---------- 8. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--grid-600);
  background: transparent;
  color: var(--paper-100);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.nav-toggle:hover { border-color: var(--signal-cyan); color: var(--signal-cyan); }

.nav-toggle__bars { display: grid; gap: 4px; }

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 1px;
  background: var(--signal-cyan);
  transition: transform 200ms var(--ease), opacity 200ms var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(5px) 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(-5px) rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

/* ---------- 9. 导航 ---------- */
.nav-bar {
  border-top: 1px solid var(--grid-600);
  background: rgba(10, 18, 16, 0.42);
}

.site-nav {
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 0;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__list > li + li { border-left: 1px solid var(--grid-600); }

.site-nav__link {
  position: relative;
  display: block;
  padding: 14px 22px;
  font-size: var(--fs-13);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--paper-100);
  text-decoration: none;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 8px;
  height: 1px;
  background: var(--signal-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms var(--ease);
}

.site-nav__link:hover {
  color: var(--signal-cyan);
  background: rgba(53, 240, 208, 0.05);
  text-decoration: none;
}

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

.site-nav__link[aria-current="page"] {
  color: var(--signal-orange);
  background: rgba(255, 138, 61, 0.06);
}

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

.site-nav__note {
  display: none;
  max-width: none;
  padding: 12px 0 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--slate-500);
  text-align: center;
}

/* ---------- 10. 阅读进度线 ---------- */
.scroll-meter {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--signal-cyan);
  pointer-events: none;
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  background-color: var(--charcoal-800);
  border-top: 1px solid var(--grid-600);
  margin-top: 72px;
}

.site-footer .wrap { padding-bottom: 32px; }

.footer__masthead {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: end;
  gap: 18px 40px;
  padding: 40px 0 28px;
  border-bottom: 1px solid var(--grid-600);
}

.footer__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--paper-100);
}

.footer__brand:hover { text-decoration: none; color: var(--paper-100); }

.footer__brand-mark {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.02em;
  color: var(--paper-100);
  transition: color 200ms var(--ease);
}

.footer__brand:hover .footer__brand-mark { color: var(--signal-cyan); }

.footer__brand-words { display: grid; gap: 2px; }

.footer__brand-name {
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.footer__brand-sub {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--slate-500);
  line-height: 1.2;
}

.footer__summary {
  max-width: 34ch;
  justify-self: start;
  font-size: var(--fs-16);
  line-height: 1.6;
  color: var(--paper-100);
}

.footer__stamp {
  justify-self: end;
  padding: 8px 12px;
  border: 1px solid var(--grid-600);
  background: rgba(200, 178, 124, 0.06);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--sand-400);
  white-space: nowrap;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.5fr);
  gap: 32px;
  padding: 32px 0 36px;
  border-bottom: 1px solid var(--grid-600);
}

.footer__group { min-width: 0; }

.footer__group-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--grid-600);
  font-family: var(--font-body);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1;
  color: var(--sand-400);
}

.footer__list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }

.footer__link {
  display: inline-block;
  font-size: var(--fs-16);
  line-height: 1.4;
  color: var(--paper-100);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.footer__link:hover {
  color: var(--signal-cyan);
  border-bottom-color: rgba(53, 240, 208, 0.6);
  text-decoration: none;
}

.footer__contact {
  display: grid;
  gap: 9px;
  font-style: normal;
  font-size: var(--fs-16);
  line-height: 1.5;
  color: var(--paper-100);
}

.footer__contact-line { display: flex; flex-wrap: wrap; gap: 8px; }

.footer__contact-key {
  flex: none;
  min-width: 3em;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--slate-500);
  padding-top: 0.28em;
}

.footer__contact-line--note {
  display: block;
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--slate-500);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--slate-500);
}

.footer__legal-item { line-height: 1.6; }

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: none;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--slate-500);
}

.breadcrumb a {
  color: var(--slate-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.breadcrumb a:hover {
  color: var(--signal-cyan);
  border-bottom-color: var(--signal-cyan);
  text-decoration: none;
}

.breadcrumb__sep { color: var(--grid-600); }

.breadcrumb [aria-current="page"] { color: var(--paper-100); }

/* ---------- 13. 章节抬头与小件 ---------- */
.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding-bottom: 12px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--grid-600);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-cyan);
  font-variant-numeric: tabular-nums;
}

.section-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-40);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper-100);
  margin: 0;
}

.stamp {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--grid-600);
  background: rgba(200, 178, 124, 0.06);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--sand-400);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border: 1px solid rgba(53, 240, 208, 0.4);
  background: rgba(53, 240, 208, 0.07);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--signal-cyan);
  white-space: nowrap;
}

/* ---------- 14. 卡片 ---------- */
.card {
  padding: 20px;
  background: var(--charcoal-800);
  border: 1px solid var(--grid-600);
  border-radius: 0;
  transition: border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.card:hover,
.card:focus-within {
  border-color: var(--signal-cyan);
  background: var(--teal-700);
}

/* ---------- 15. 图像容器（页面阶段放 <img> 占位） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--grid-600);
  background-color: var(--teal-700);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(36, 50, 44, 0.75) 0 1px,
    transparent 1px 14px
  );
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06) brightness(0.94);
  transition: transform 240ms var(--ease), filter 240ms var(--ease);
}

.media-frame:hover img {
  transform: scale(1.02);
  filter: saturate(1) contrast(1.04) brightness(1);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 6px 10px;
  background: rgba(10, 18, 16, 0.86);
  border-top: 1px solid var(--grid-600);
  border-right: 1px solid var(--grid-600);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--sand-400);
}

/* ---------- 16. 章节索引高亮（配合 JS） ---------- */
[data-section-link].is-current {
  color: var(--focus-violet);
  border-left-color: var(--focus-violet);
}

/* ---------- 17. 断点 ---------- */
@media (max-width: 1180px) {
  .masthead__grid { gap: 16px 24px; }
  .site-nav__link { padding: 14px 16px; }
  .site-nav__link::after { left: 16px; right: 16px; }
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
  .footer__masthead { grid-template-columns: auto minmax(0, 1fr); }
  .footer__stamp { grid-column: 1 / -1; justify-self: start; }
}

@media (max-width: 900px) {
  .masthead__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px 16px;
    padding: 18px 0 16px;
  }

  .brand { grid-column: 1; grid-row: 1; justify-self: start; gap: 10px; }
  .brand__mark { font-size: 34px; }
  .masthead__side { grid-column: 2; grid-row: 1; justify-self: end; gap: 10px; }
  .masthead__meta { grid-column: 1 / -1; grid-row: 2; justify-self: start; }

  .tagline { display: none; }
  .masthead__side .btn { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav { display: none; padding: 0; }
  .site-nav[data-open="true"] { display: block; }

  .site-nav__list { flex-direction: column; align-items: stretch; }
  .site-nav__list > li + li { border-left: 0; border-top: 1px solid var(--grid-600); }

  .site-nav__link { padding: 15px 0; font-size: var(--fs-16); letter-spacing: 0.1em; }
  .site-nav__link::after { left: 0; right: auto; width: 28px; bottom: 9px; }

  .site-nav__note { display: block; text-align: left; }

  .footer__masthead { grid-template-columns: minmax(0, 1fr); gap: 16px; padding: 32px 0 22px; }
  .footer__summary { max-width: none; }
  .footer__legal { justify-content: flex-start; }

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

@media (max-width: 640px) {
  .brand__words { gap: 1px; }
  .brand__name { font-size: var(--fs-16); }
  .brand__sub { letter-spacing: 0.1em; }

  .issue-badge { gap: 4px 8px; }
  .issue-badge__state { padding: 2px 6px; }

  .footer__cols { grid-template-columns: minmax(0, 1fr); gap: 26px; padding: 26px 0 30px; }
  .footer__summary { font-size: var(--fs-16); }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .section-head__title { font-size: var(--fs-28); }
  .site-footer { margin-top: 56px; }
}

/* ---------- 18. 降低动效 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .btn:hover { transform: none; }
  .media-frame:hover img { transform: none; }
}