/* ============================================================
   MANBETX赛场 · 共享样式 /assets/site.css
   高原夜航 · 框景 + 刻度 · 左右分屏系统
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --c-deep: #071729;
  --c-night: #0E2340;
  --c-lake: #17A2A6;
  --c-lake-soft: #6FD3D2;
  --c-gold: #E8B23A;
  --c-gold-soft: #F6D98A;
  --c-mist: #F4F6F8;
  --c-stone: #8A94A6;
  --c-hair: #1D3A5C;
  --c-live: #43C08A;

  --ink: #F4F6F8;
  --ink-dim: rgba(244, 246, 248, .68);
  --ink-faint: rgba(244, 246, 248, .44);

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", monospace;

  --w-max: 1280px;
  --gutter: clamp(18px, 4vw, 48px);
  --header-offset: 112px;
  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  background-color: var(--c-night);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
body[data-nav-open] { overflow: hidden; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; padding: 0; cursor: pointer; }
ul, ol { list-style: none; padding: 0; }
table { border-collapse: collapse; width: 100%; }
input, textarea, select { font: inherit; color: inherit; }

#main-content { scroll-margin-top: 96px; }

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.1;
  text-wrap: balance;
}
h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2vw, 26px); line-height: 1.28; }
h4 { font-size: clamp(17px, 1.5vw, 20px); line-height: 1.35; }
p { text-wrap: pretty; }
strong { font-weight: 700; }
code, kbd, samp, .mono { font-family: var(--font-mono); font-size: .92em; }

::selection { background: rgba(23, 162, 166, .38); color: #fff; }

/* ---------- 4. 焦点可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--c-lake-soft);
  outline-offset: 3px;
  border-radius: 1px;
}
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 1200;
  background: var(--c-gold);
  color: #0B1726;
  font-size: 14px;
  font-weight: 700;
  padding: 11px 20px;
  border-radius: var(--radius);
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap-tight { max-width: 880px; }
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}
.flow > * + * { margin-top: var(--flow-gap, 18px); }

/* ---------- 6. 索引标签与章节标记 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-lake-soft);
  line-height: 1;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-lake);
  flex: 0 0 auto;
}
.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-gold);
  padding-top: 9px;
  border-top: 1px solid rgba(232, 178, 58, .62);
  line-height: 1;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 19px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: .01em;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-gold {
  background: var(--c-gold);
  border-color: var(--c-gold);
  color: #0B1726;
}
.btn-gold:hover { background: var(--c-gold-soft); border-color: var(--c-gold-soft); }

.btn-line {
  background: rgba(244, 246, 248, .03);
  border-color: var(--c-hair);
  color: var(--ink);
}
.btn-line:hover {
  border-color: var(--c-lake);
  background: rgba(23, 162, 166, .14);
  color: #fff;
}

.btn-lake {
  background: var(--c-lake);
  border-color: var(--c-lake);
  color: #04141F;
}
.btn-lake:hover { background: var(--c-lake-soft); border-color: var(--c-lake-soft); }

/* ---------- 8. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 900;
  background: linear-gradient(to bottom,
              rgba(7, 23, 41, .90) 0%,
              rgba(7, 23, 41, .58) 62%,
              rgba(7, 23, 41, 0) 100%);
  transition: background-color .28s var(--ease), box-shadow .28s var(--ease);
}
.site-header[data-scrolled] {
  background-color: rgba(7, 23, 41, .95);
  background-image: none;
  box-shadow: 0 1px 0 var(--c-hair), 0 22px 44px -30px rgba(0, 0, 0, .96);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
}

.header-scale {
  height: 6px;
  background-image: repeating-linear-gradient(to right,
                    var(--c-hair) 0 1px, transparent 1px 28px);
  opacity: .85;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 7%, #000 93%, transparent);
}

.header-inner {
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 34px);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}
.brand-glyph {
  position: relative;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(23, 162, 166, .78);
  background: linear-gradient(150deg, rgba(23, 162, 166, .26), rgba(23, 162, 166, 0));
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--c-lake-soft);
  border-radius: var(--radius);
}
.brand-glyph::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 8px;
  height: 8px;
  background: var(--c-gold);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.16; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -.01em;
  color: #fff;
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-stone);
}

/* 主导航 */
.site-nav { margin-left: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-item { display: block; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  font-size: 14.5px;
  line-height: 1.3;
  color: rgba(244, 246, 248, .68);
  transition: color .2s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1px;
  background: var(--c-lake);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .26s var(--ease), background-color .2s var(--ease);
}
.nav-link:hover { color: #fff; }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: #fff; }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--c-gold);
}
.nav-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--c-gold);
  opacity: .9;
}
.nav-foot { display: none; }

/* 头部行动区 */
.header-cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.header-cta .btn { padding: 10px 15px; font-size: 13.5px; }

/* 移动端切换按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid var(--c-hair);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--c-lake); color: #fff; }
.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 18px;
  flex: 0 0 auto;
}
.nav-toggle-bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-text { line-height: 1; }

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  pointer-events: none;
  background: rgba(29, 58, 92, .5);
}
.read-progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-lake), var(--c-gold));
  will-change: transform;
}

/* ---------- 9. 移动导航（≤1080px） ---------- */
@media (max-width: 1080px) {
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 890;
    width: min(90vw, 400px);
    margin-left: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 106px var(--gutter) 36px;
    background: var(--c-deep);
    border-left: 1px solid var(--c-hair);
    overflow-y: auto;
    transform: translateX(101%);
    transition: transform .3s var(--ease);
  }
  .site-nav[data-open] { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-link {
    display: flex;
    align-items: baseline;
    justify-content: flex-start;
    padding: 15px 0;
    font-size: 17px;
    border-bottom: 1px solid var(--c-hair);
    color: rgba(244, 246, 248, .78);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    color: var(--c-gold-soft);
    border-bottom-color: rgba(23, 162, 166, .6);
  }
  .nav-link[aria-current="page"] .nav-idx { color: var(--c-lake-soft); }

  .nav-foot {
    display: grid;
    gap: 10px;
    margin-top: auto;
    padding-top: 28px;
  }
  .nav-foot .btn { width: 100%; padding: 15px 18px; }
}

@media (max-width: 640px) {
  .brand-tag { display: none; }
  .brand-glyph { width: 36px; height: 36px; font-size: 12px; }
  .brand-name { font-size: 17px; }
  .header-inner { padding: 10px var(--gutter); }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-deep);
  border-top: 1px solid var(--c-hair);
  color: var(--ink-dim);
}
.footer-scale {
  height: 6px;
  background-image: repeating-linear-gradient(to right,
                    var(--c-hair) 0 1px, transparent 1px 28px);
  opacity: .7;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 7%, #000 93%, transparent);
}
.footer-inner {
  max-width: var(--w-max);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 76px) var(--gutter) 28px;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 1.65fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.footer-lockup {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -.01em;
  color: #fff;
}
.footer-intro {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-dim);
  max-width: 38ch;
}
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-live);
}
.dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--c-live);
  box-shadow: 0 0 0 3px rgba(67, 192, 138, .16);
  animation: statusPulse 2.6s ease-in-out infinite;
}
@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .42; }
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-lake-soft);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--c-hair);
}
.footer-col ul { display: grid; gap: 9px; }
.footer-col a {
  display: inline-block;
  font-size: 14px;
  color: var(--ink-dim);
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-col a:hover { color: var(--c-gold-soft); padding-left: 4px; }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 20px 32px;
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: 26px;
  border-top: 1px solid var(--c-hair);
}
.contact-item { display: grid; gap: 5px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-stone);
}
.contact-value { font-size: 14.5px; color: var(--c-mist); word-break: break-word; }
.contact-note {
  grid-column: 1 / -1;
  max-width: 78ch;
  padding-left: 14px;
  border-left: 2px solid var(--c-hair);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-faint);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--c-hair);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--ink-faint);
}
.footer-bottom a { color: var(--ink-faint); transition: color .2s var(--ease); }
.footer-bottom a:hover { color: var(--c-lake-soft); }
.footer-copy { color: var(--ink-faint); }
.footer-icp { margin-left: auto; color: var(--c-stone); }

@media (max-width: 940px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 20px; }
}
@media (max-width: 520px) {
  .footer-cols { grid-template-columns: 1fr; }
  .footer-icp { margin-left: 0; }
  .footer-bottom { gap: 8px 16px; }
}

/* ---------- 11. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-stone);
}
.crumbs a { color: var(--c-stone); transition: color .2s var(--ease); }
.crumbs a:hover { color: var(--c-lake-soft); }
.crumbs-sep { color: var(--c-hair); }
.crumbs [aria-current="page"] { color: var(--c-gold-soft); }

/* ---------- 12. 图片容器（供页面阶段放置占位图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-hair);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(29, 58, 92, .55), rgba(7, 23, 41, .9));
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 23, 41, .62), transparent 58%);
  pointer-events: none;
}
.media-wide { aspect-ratio: 21 / 9; }
.media-tall { aspect-ratio: 3 / 4; }
.media-square { aspect-ratio: 1 / 1; }
.media-tag {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-gold-soft);
  background: rgba(7, 23, 41, .88);
  border-top: 1px solid var(--c-hair);
  border-right: 1px solid var(--c-hair);
}

/* ---------- 13. 卡片与阅读面 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--c-hair);
  border-radius: var(--radius);
  background: linear-gradient(168deg, rgba(29, 58, 92, .34), rgba(7, 23, 41, .58));
  box-shadow: 0 22px 46px -40px rgba(0, 0, 0, .96);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}
.card:hover {
  border-color: rgba(23, 162, 166, .55);
  transform: translateY(-3px);
}

.surface-light {
  background: var(--c-mist);
  color: #14273E;
}
.surface-light h1,
.surface-light h2,
.surface-light h3,
.surface-light h4 { color: #0E2340; }
.surface-light a { color: #0C6C70; text-decoration: underline; text-underline-offset: 3px; }
.surface-light a:hover { color: #17A2A6; }

/* ---------- 14. 滚动章节高亮协议 ---------- */
[data-observe] {
  position: relative;
  transition: color .3s var(--ease);
}
[data-observe]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 0;
  background: linear-gradient(to bottom, var(--c-lake), var(--c-gold));
  transition: height .45s var(--ease);
  pointer-events: none;
}
[data-observe].is-current::before { height: 100%; }

/* ---------- 15. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  .site-nav { transition: none; }
  .card:hover { transform: none; }
}

/* ---------- 16. 打印兜底 ---------- */
@media print {
  .site-header, .site-footer, .skip-link { display: none !important; }
  body { background: #fff; color: #000; }
}