/* =====================================================================
   必赢亚州游戏 / assets/site.css
   共享外壳：双层头部、资料档案式页脚、通用组件与基础排版
   ===================================================================== */

/* ---------- 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, ul, ol, dl, dd { margin: 0; }
ul[class], ol[class] { list-style: none; padding: 0; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #06140F;
  --deep: #0B2A1F;
  --pitch: #15543A;
  --amber: #E3A83B;
  --amber-soft: #F6D27E;
  --paper: #F1E6CE;
  --white: #F8FBF8;
  --charcoal: #1B1F1C;
  --ember: #D6533B;
  --moss: #6A7C72;

  --line: rgba(227, 168, 59, 0.24);
  --line-strong: rgba(227, 168, 59, 0.52);
  --hair: rgba(106, 124, 114, 0.42);

  --font-head: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Roboto Mono", Consolas, "Courier New", monospace;

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 44px);
  --pad-panel: clamp(18px, 2.6vw, 30px);
  --cut: 20px;
  --ease: cubic-bezier(0.32, 0.72, 0.24, 1);
}

/* ---------- 3. 全局排版与底色 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(112deg, rgba(21, 84, 58, 0.16) 0 1px, transparent 1px 128px),
    radial-gradient(1100px 520px at 88% -8%, rgba(227, 168, 59, 0.10), transparent 62%),
    radial-gradient(760px 420px at 4% 106%, rgba(21, 84, 58, 0.34), transparent 60%),
    linear-gradient(180deg, #07160F 0%, #04100B 58%, #07160F 100%);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.012em;
  color: var(--white);
}
h1 { font-size: clamp(1.9rem, 4.6vw, 3.2rem); }
h2 { font-size: clamp(1.4rem, 2.9vw, 2.05rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.34rem); font-weight: 800; }

::selection {
  background: var(--amber);
  color: var(--charcoal);
}

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

#main-content:focus { outline: none; }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器 ---------- */
.shell {
  width: 100%;
  max-width: calc(var(--shell) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-main {
  display: block;
  padding-block: clamp(24px, 4vw, 54px);
}

/* ---------- 5. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--amber);
  color: var(--charcoal);
  font-weight: 800;
  font-size: 0.92rem;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 86% 100%, 0 100%);
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 0; }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-image:
    repeating-linear-gradient(112deg, rgba(21, 84, 58, 0.22) 0 1px, transparent 1px 88px),
    linear-gradient(180deg, rgba(6, 20, 15, 0.99), rgba(11, 42, 31, 0.97));
  border-bottom: 1px solid var(--line-strong);
}

.header-top {
  background-color: rgba(4, 16, 11, 0.72);
  border-bottom: 1px dashed var(--hair);
}
.header-top__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 22px;
  padding-block: 8px;
}
.header-brandline {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--amber-soft);
}
.header-brandline__dot {
  display: inline-block;
  width: 9px;
  height: 10px;
  flex: none;
  background: var(--amber);
  transform: skewX(-20deg);
}
.header-top__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--moss);
}
.header-top__item { white-space: nowrap; }
.header-top__item + .header-top__item::before {
  content: "/";
  margin-right: 12px;
  color: rgba(106, 124, 114, 0.55);
}

.header-main {
  border-top: 1px solid rgba(227, 168, 59, 0.08);
}
.header-main__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 28px);
  padding-block: 13px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--white);
  flex: none;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--charcoal);
  background: linear-gradient(140deg, var(--amber-soft), var(--amber));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 78% 100%, 0 100%);
  transition: background 0.2s var(--ease);
}
.brand:hover .brand__mark,
.brand:focus-visible .brand__mark {
  background: linear-gradient(140deg, #FFE9B4, var(--amber-soft));
}
.brand__text { display: block; min-width: 0; }
.brand__name {
  display: block;
  font-size: 1.02rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: 0.02em;
}
.brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.5;
  letter-spacing: 0.16em;
  color: var(--moss);
}
.brand--footer .brand__name { color: var(--white); }

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  color: var(--amber-soft);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 86% 100%, 0 100%);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  background-color: rgba(227, 168, 59, 0.14);
  color: var(--white);
}
.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
  flex: none;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(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(-5px) rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

/* 导航（移动端默认折叠） */
.site-nav {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 1px);
  z-index: 6;
  visibility: hidden;
  max-height: 0;
  overflow: hidden;
  background-image: linear-gradient(180deg, var(--deep), #07170F);
  border-bottom: 1px solid var(--line-strong);
  box-shadow: 0 26px 50px rgba(0, 0, 0, 0.55);
  transition: max-height 0.3s var(--ease), visibility 0s linear 0.3s;
}
.site-nav[data-open="true"] {
  visibility: visible;
  max-height: 78vh;
  overflow-y: auto;
  transition: max-height 0.3s var(--ease), visibility 0s linear 0s;
}
.site-nav__list {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 8px var(--gutter) 18px;
  list-style: none;
  counter-reset: nav;
}
.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 14px 6px;
  font-size: 1rem;
  font-weight: 600;
  color: #D8E5DC;
  text-decoration: none;
  border-bottom: 1px solid rgba(106, 124, 114, 0.26);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.site-nav__list > li:last-child .site-nav__link { border-bottom: 0; }
.site-nav__link::before {
  counter-increment: nav;
  content: counter(nav, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--moss);
  transition: color 0.18s var(--ease);
}
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--white);
  background-color: rgba(21, 84, 58, 0.6);
}
.site-nav__link:hover::before,
.site-nav__link:focus-visible::before { color: var(--amber-soft); }
.site-nav__link[aria-current="page"] {
  background-color: var(--amber);
  color: var(--charcoal);
  font-weight: 800;
}
.site-nav__link[aria-current="page"]::before {
  color: rgba(27, 31, 28, 0.6);
}

/* 阅读进度 */
.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 4;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--pitch) 0%, var(--amber) 62%, var(--amber-soft) 100%);
  pointer-events: none;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(44px, 7vw, 96px);
  padding-top: clamp(28px, 4.5vw, 54px);
  background-image:
    repeating-linear-gradient(112deg, rgba(21, 84, 58, 0.22) 0 1px, transparent 1px 96px),
    linear-gradient(180deg, rgba(11, 42, 31, 0.98), #04100B 74%);
  border-top: 1px solid var(--line-strong);
  color: #D6E3DA;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background-image: repeating-linear-gradient(105deg, var(--amber) 0 22px, transparent 22px 44px);
  opacity: 0.75;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(26px, 4vw, 46px);
}
.footer-brand { min-width: 0; }
.footer-summary {
  margin-top: 16px;
  max-width: 34em;
  font-size: 0.94rem;
  line-height: 1.8;
  color: #B9CCC1;
}
.footer-stamp {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--moss);
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--hair);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.6;
  letter-spacing: 0.18em;
  color: var(--amber-soft);
}
.footer-links {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.94rem;
  color: #D6E3DA;
  text-decoration: none;
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}
.footer-link::before {
  content: "/";
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(227, 168, 59, 0.55);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--amber-soft);
  transform: translateX(2px);
}
.footer-contact {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}
.footer-contact li {
  padding-left: 12px;
  border-left: 2px solid rgba(227, 168, 59, 0.38);
}
.footer-contact__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--moss);
}
.footer-contact__val {
  display: block;
  color: #DEE9E2;
  word-break: break-word;
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 26px;
  padding-block: 18px;
  border-top: 1px dashed var(--hair);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--moss);
}
.footer-bottom__copy { margin: 0; }
.footer-bottom__note {
  margin: 0;
  max-width: 54ch;
  line-height: 1.75;
  color: rgba(106, 124, 114, 0.96);
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: clamp(12px, 3vw, 26px);
  bottom: clamp(12px, 3vw, 26px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  background: var(--amber);
  color: var(--charcoal);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 84% 100%, 0 100%);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
  transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.to-top:hover,
.to-top:focus-visible {
  background: var(--amber-soft);
  transform: translateY(-2px);
}
.to-top[hidden] { display: none; }

/* ---------- 8. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  background: var(--amber);
  color: var(--charcoal);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 88% 100%, 0 100%);
  transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn:hover,
.btn:focus-visible {
  background: var(--amber-soft);
  transform: translateY(-1px);
}
.btn--ghost {
  background: transparent;
  color: var(--amber-soft);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(227, 168, 59, 0.14);
  color: var(--white);
}
.btn--paper {
  background: var(--paper);
  color: var(--charcoal);
}
.btn--paper:hover,
.btn--paper:focus-visible { background: #FFF6E2; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { margin-bottom: clamp(14px, 2vw, 24px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--moss);
}
.breadcrumb__link {
  color: var(--amber-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  border-bottom-color: var(--amber-soft);
}
.breadcrumb__sep { color: rgba(106, 124, 114, 0.7); }
.breadcrumb__current,
.breadcrumb [aria-current="page"] { color: var(--white); }

/* ---------- 10. 正文与网格 ---------- */
.prose {
  max-width: 38em;
  font-size: 1.02rem;
  line-height: 1.8;
  color: #DCE6DF;
}
.prose p { margin-bottom: 1.1em; }
.prose p:last-child { margin-bottom: 0; }
.prose a { color: var(--amber-soft); text-underline-offset: 3px; }
.prose ul,
.prose ol {
  margin: 0 0 1.1em;
  padding-left: 1.4em;
}
.prose li { margin-bottom: 0.4em; }
.prose strong { color: var(--white); font-weight: 800; }

.grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 26px);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

/* ---------- 11. 切角面板 ---------- */
.panel {
  position: relative;
  padding: var(--pad-panel);
  background-image: linear-gradient(160deg, rgba(11, 42, 31, 0.94), rgba(6, 20, 15, 0.98));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}
.panel__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--amber);
}
.panel__title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 1.8vw, 1.24rem);
  font-weight: 800;
  line-height: 1.35;
}
.panel--paper {
  background-image: linear-gradient(160deg, #F7EEDC, var(--paper));
  border-color: rgba(27, 31, 28, 0.14);
  color: var(--charcoal);
}
.panel--paper .panel__title { color: var(--charcoal); }
.panel--paper .panel__eyebrow { color: #9A6B12; }
.panel--paper p { color: #33383A; }

/* ---------- 12. 章节编号索引 ---------- */
.section-index {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
}
.section-index__num {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
  transition: color 0.35s var(--ease), text-shadow 0.35s var(--ease);
}
.section-index__label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--moss);
}
[data-index-item].is-lit .section-index__num {
  color: var(--amber-soft);
  text-shadow: 0 0 18px rgba(246, 210, 126, 0.45);
}

/* ---------- 13. 图片容器基础 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background-image: linear-gradient(150deg, var(--pitch), #05110C);
  box-shadow: inset 0 0 0 1px var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--4x3 { aspect-ratio: 4 / 3; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 14. 断点 ---------- */
@media (max-width: 900px) {
  .header-top__inner { justify-content: flex-start; }
  .header-top__item { white-space: normal; }
  .brand__sub { letter-spacing: 0.1em; }
}

@media (min-width: 861px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 901px) {
  .nav-toggle { display: none; }
  .site-nav {
    position: static;
    visibility: visible;
    max-height: none;
    overflow: visible;
    background-image: none;
    border: 0;
    box-shadow: none;
    transition: none;
  }
  .site-nav__list {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 2px;
    padding: 0;
  }
  .site-nav__link {
    padding: 10px 14px;
    font-size: 0.94rem;
    border-bottom: 0;
    border-radius: 2px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  }
}

@media (min-width: 1024px) {
  .site-nav__link { font-size: 0.97rem; padding: 11px 16px; }
}

@media (max-width: 420px) {
  .header-top__meta { font-size: 0.68rem; }
  .brand__mark { width: 38px; height: 38px; font-size: 0.96rem; }
  .nav-toggle { padding: 9px 12px; letter-spacing: 0.1em; }
  .to-top { padding: 10px 14px; font-size: 0.7rem; }
}

/* ---------- 15. 动效降级 ---------- */
@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;
  }
  .footer-link:hover,
  .footer-link:focus-visible,
  .btn:hover,
  .btn:focus-visible,
  .to-top:hover,
  .to-top:focus-visible { transform: none; }
}