/* ============================================================
   9393网页版 · 共享样式 / assets/site.css
   盐湖白底 + 深湖蓝命令栏 + 赭石橙数字 + 经幡黄节点
   ============================================================ */

:root {
  --lake-deep: #0B5F7A;
  --lake: #1C8FB0;
  --salt-blue: #DFF1F5;
  --salt-blue-line: #C6E2EA;
  --salt-white: #F7FAF9;
  --panel: #FFFFFF;
  --ink: #0F1E24;
  --muted: #5C6B70;
  --grid: #A9B8BD;
  --ochre: #C25E2E;
  --flag: #E8B33A;
  --electric: #16B8A6;
  --alert: #B23A3A;

  --font-sans: "HarmonyOS Sans", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --w-max: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 62px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--salt-white);
  background-image: linear-gradient(to right, rgba(169, 184, 189, .13) 1px, transparent 1px);
  background-size: 88px 100%;
  background-position: 0 0;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; height: auto; display: block; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

a { color: var(--lake-deep); text-decoration: none; }
a:hover { color: var(--lake); }

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

::selection {
  background: var(--flag);
  color: var(--ink);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 18px); }

.visually-hidden {
  position: absolute !important;
  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;
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 12px;
  z-index: 999;
  transform: translateY(-140%);
  padding: 12px 18px;
  background: var(--ink);
  color: #FFFFFF;
  font-size: 14px;
  letter-spacing: .06em;
  border-bottom: 3px solid var(--flag);
  transition: transform .18s var(--ease);
}
.skip-link:focus { transform: translateY(0); color: #FFFFFF; }

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--salt-white);
  border-bottom: 1px solid var(--grid);
}

.site-header__strip {
  background: var(--lake-deep);
  max-height: 34px;
  overflow: hidden;
  transition: max-height .26s var(--ease), opacity .26s var(--ease);
}
.site-header.is-stuck .site-header__strip {
  max-height: 0;
  opacity: 0;
}

.site-header__strip-inner {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header__status {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: #CFE8EE;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--electric);
}

.site-header__coords {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: #7FB4C4;
  white-space: nowrap;
}

.site-header__bar {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  flex-wrap: wrap;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--ink);
}
.brand__mark {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lake-deep);
}
.brand__slash {
  font-weight: 700;
  color: var(--ochre);
}
.brand__text {
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--muted);
}
.brand:hover .brand__text { color: var(--lake-deep); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: 0;
  color: var(--ink);
  font-size: 12.5px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .16s var(--ease), background-color .16s var(--ease);
}
.nav-toggle:hover { border-color: var(--lake); background: var(--salt-blue); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ink);
  transition: background-color .16s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--ink);
  transition: transform .18s var(--ease), top .18s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }
.nav-toggle__label { line-height: 1; }

/* 导航 */
.site-nav { margin-left: auto; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: navidx;
}
.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 10px;
  counter-increment: navidx;
  font-size: 13px;
  letter-spacing: .07em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.site-nav__link::before {
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  letter-spacing: 0;
  color: var(--grid);
  transition: color .16s var(--ease);
}
.site-nav__link:hover {
  color: var(--lake-deep);
  background: var(--salt-blue);
}
.site-nav__link:hover::before { color: var(--lake); }
.site-nav__link[aria-current="page"] {
  color: var(--lake-deep);
  font-weight: 700;
  background: var(--salt-blue);
  border-bottom-color: var(--lake);
}
.site-nav__link[aria-current="page"]::before { color: var(--ochre); }

.site-header__cta { flex: 0 0 auto; }

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--ochre);
  transition: width .08s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--lake-deep);
  color: #DDEFF4;
  font-family: var(--font-sans);
}
.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: repeating-linear-gradient(
    90deg,
    var(--flag) 0 22px,
    var(--ochre) 22px 44px,
    rgba(255, 255, 255, .22) 44px 66px
  );
}

.site-footer__inner {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 62px) var(--gutter) clamp(18px, 3vw, 30px);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(24px, 3.4vw, 40px);
  border-bottom: 1px solid rgba(223, 241, 245, .2);
}

.site-footer__mark {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #FFFFFF;
  margin-bottom: 10px;
}
.site-footer__mark-num { color: var(--flag); }

.site-footer__note {
  font-size: 13px;
  line-height: 1.75;
  color: #9FCBD8;
  max-width: 32ch;
}

.site-footer__contact {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px clamp(20px, 3vw, 40px);
  margin: 0;
  align-content: start;
}
.site-footer__contact-item { min-width: 0; }
.site-footer__contact-item dt {
  font-size: 11px;
  letter-spacing: .18em;
  color: #8FBECC;
  margin-bottom: 5px;
}
.site-footer__contact-item dd {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: #EAF6F9;
  word-break: break-word;
}
.site-footer__contact-item:nth-child(1) dd,
.site-footer__contact-item:nth-child(2) dd {
  font-family: var(--font-mono);
  letter-spacing: .01em;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  flex-wrap: wrap;
  padding-top: 18px;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
}
.site-footer__legal a {
  font-size: 13px;
  letter-spacing: .06em;
  color: #CFE8EE;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.site-footer__legal a:hover {
  color: #FFFFFF;
  border-bottom-color: var(--flag);
}

.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: #8FBECC;
}

/* ============================================================
   通用版式与组件
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-main { display: block; }

/* 字号阶梯 */
.t-display {
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -.02em;
}
.t-h1 {
  font-size: clamp(30px, 4.2vw, 48px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -.01em;
}
.t-h2 {
  font-size: clamp(23px, 2.8vw, 32px);
  line-height: 1.22;
  font-weight: 700;
}
.t-h3 {
  font-size: clamp(18px, 1.9vw, 22px);
  line-height: 1.38;
  font-weight: 700;
}
.t-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 44px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ochre);
  line-height: 1.1;
}
.t-mono { font-family: var(--font-mono); }
.t-muted { color: var(--muted); }
.t-small { font-size: 13px; line-height: 1.65; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--ochre);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--ochre);
  flex: 0 0 auto;
}

.margin-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--muted);
  line-height: 1;
}

/* 正文块 */
.prose {
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.75;
}
.prose > * + * { margin-top: 1.2em; }
.prose h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -.01em;
  margin-top: 1.9em;
}
.prose h3 {
  font-size: clamp(18px, 1.9vw, 22px);
  line-height: 1.4;
  font-weight: 700;
  margin-top: 1.6em;
}
.prose ul, .prose ol { padding-left: 1.4em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .5em; }
.prose strong { font-weight: 700; }
.prose a { border-bottom: 1px solid var(--salt-blue-line); }
.prose a:hover { border-bottom-color: var(--ochre); }
.prose blockquote {
  margin-left: 0;
  padding: 12px 0 12px 20px;
  border-left: 3px solid var(--flag);
  color: var(--muted);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--lake-deep);
  border-radius: 0;
  background: var(--lake-deep);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .07em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .16s var(--ease), border-color .16s var(--ease), color .16s var(--ease), transform .16s var(--ease);
}
.btn:hover {
  background: var(--lake);
  border-color: var(--lake);
  color: #FFFFFF;
  transform: translateY(-2px);
}
.btn--compact {
  padding: 9px 15px;
  font-size: 12.5px;
  letter-spacing: .08em;
}
.btn--ghost {
  background: transparent;
  color: var(--lake-deep);
}
.btn--ghost:hover {
  background: var(--salt-blue);
  border-color: var(--lake);
  color: var(--lake-deep);
}
.btn--accent {
  background: var(--ochre);
  border-color: var(--ochre);
  color: #FFFFFF;
}
.btn--accent:hover {
  background: #A94E23;
  border-color: #A94E23;
  color: #FFFFFF;
}

/* 面包屑 */
.breadcrumb {
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
}
.breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--grid);
}
.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .16s var(--ease);
}
.breadcrumb a:hover { color: var(--lake-deep); }
.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 700; }

/* 网格 */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}
.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)); }

/* 面板 */
.panel {
  background: var(--panel);
  border: 1px solid var(--grid);
  padding: clamp(16px, 2.2vw, 28px);
}
.panel--tint {
  background: var(--salt-blue);
  border-color: var(--salt-blue-line);
}

/* 图片容器基础规则（页面阶段放置占位图） */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--salt-blue);
  border: 1px solid var(--grid);
  aspect-ratio: 16 / 9;
}
.media img,
.media svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.03);
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media--4x5  { aspect-ratio: 4 / 5; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 11px;
  background: var(--lake-deep);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.4;
}

/* 索引链接高亮（由页面 JS 协议驱动） */
[data-index-link][aria-current] {
  color: var(--lake-deep);
  font-weight: 700;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .site-nav__link { padding: 9px 8px; font-size: 12.5px; }
  .brand__text { display: none; }
}

@media (max-width: 960px) {
  .site-header__bar {
    padding-top: 9px;
    padding-bottom: 9px;
    gap: 10px;
  }
  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }
  .site-nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
    display: none;
    border-top: 1px solid var(--grid);
    margin-top: 8px;
    padding-top: 6px;
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .site-nav__link {
    padding: 13px 6px;
    font-size: 15px;
    letter-spacing: .06em;
    border-bottom: 1px solid var(--salt-blue-line);
  }
  .site-nav__link:last-child { border-bottom: 0; }
  .site-nav__link[aria-current="page"] {
    border-bottom-color: var(--salt-blue-line);
    box-shadow: inset 3px 0 0 var(--lake);
    padding-left: 14px;
  }
  .site-header__cta { display: none; }

  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
  .site-footer__note { max-width: none; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; background-size: 64px 100%; }
  .site-header__coords { display: none; }
  .site-header__status { font-size: 10.5px; letter-spacing: .1em; }
  .site-footer__contact { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .margin-note { writing-mode: horizontal-tb; letter-spacing: .12em; }
  .read-progress { height: 3px; }
}

/* ============================================================
   可访问性：减弱动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .btn:hover { transform: none; }
  .read-progress__bar { transition: none; }
}