/* ==========================================================================
   永兴集团指南 — 共享样式 /assets/site.css
   夜航指挥中心 · 路线情报站
   ========================================================================== */

/* 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, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }

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

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

button, input, select, textarea { font: inherit; color: inherit; }

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

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

table { border-collapse: collapse; width: 100%; }

/* 2. 设计令牌 -------------------------------------------------------------- */
:root {
  --steel: #0B1F33;
  --steel-deep: #071522;
  --command: #123A5A;
  --signal: #FF6A2A;
  --signal-soft: rgba(255, 106, 42, .14);
  --silver: #D7E1EA;
  --green: #2ED47A;
  --paper: #F4F7FA;
  --ink: #050A0F;
  --amber: #F2B84B;
  --link: #5BC0EB;

  --fg: var(--silver);
  --muted: rgba(215, 225, 234, .6);
  --hair: rgba(215, 225, 234, .14);
  --hair-strong: rgba(215, 225, 234, .3);

  --font-display: "Archivo Narrow", "Roboto Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1180px;
  --gutter: clamp(1rem, 4vw, 2.75rem);
  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-pill: 999px;
  --shadow-panel: 0 28px 64px -40px rgba(0, 0, 0, .9);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* 3. 基础排版 -------------------------------------------------------------- */
body {
  min-height: 100vh;
  background-color: var(--steel);
  background-image:
    linear-gradient(rgba(215, 225, 234, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(215, 225, 234, .035) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--fg);
  font-family: var(--font-body);
  font-size: clamp(16px, .55vw + 14px, 17.5px);
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: .04em;
  color: var(--paper);
}

h1 { font-size: clamp(2.5rem, 6vw, 5rem); letter-spacing: .02em; }

::selection { background: var(--signal); color: #1b0a02; }

:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 4. 页头 ------------------------------------------------------------------ */
.site-header {
  position: relative;
  z-index: 30;
  padding-inline: var(--gutter);
  background: linear-gradient(180deg, #08203A 0%, rgba(11, 31, 51, .98) 100%);
  border-bottom: 1px solid var(--hair-strong);
}

.skip-link {
  position: absolute;
  left: 50%;
  top: .5rem;
  z-index: 120;
  transform: translate(-50%, -190%);
  padding: .6rem 1.15rem;
  border-radius: var(--radius-pill);
  background: var(--signal);
  color: #1b0a02;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .06em;
  transition: transform .2s var(--ease);
}

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

.masthead {
  width: min(100%, var(--wrap));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas: "start identity end";
  align-items: center;
  gap: 1rem;
  padding-block: 1.4rem 1.1rem;
}

.masthead__rail {
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-wrap: wrap;
  min-width: 0;
}

.masthead__rail--start { grid-area: start; }
.masthead__rail--end { grid-area: end; justify-content: flex-end; }

.masthead__meta {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.masthead__meta--rev { color: var(--silver); }

.pulse {
  display: inline-block;
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 rgba(46, 212, 122, .6);
  animation: pulse 2.6s var(--ease) infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(46, 212, 122, .55); }
  70% { box-shadow: 0 0 0 12px rgba(46, 212, 122, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 212, 122, 0); }
}

.masthead__identity { grid-area: identity; text-align: center; }

.masthead__brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: .45rem;
}

.masthead__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.4vw, 2.45rem);
  line-height: 1;
  letter-spacing: .14em;
  text-indent: .14em;
  color: var(--paper);
}

.masthead__line {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .5em;
  text-indent: .5em;
  text-transform: uppercase;
  color: var(--signal);
}

.masthead__cta { padding: .6rem 1.15rem; font-size: .82rem; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .55rem .95rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hair-strong);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--silver);
  transition: background-color .25s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--silver);
  transition: transform .28s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: var(--signal); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  border-top: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(18, 58, 90, .5), rgba(11, 31, 51, 0));
}

.site-nav__list {
  width: min(100%, var(--wrap));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  padding: .75rem 0 .9rem;
  counter-reset: navidx;
}

.site-nav__item { display: flex; }

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .5rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--silver);
  font-size: .94rem;
  letter-spacing: .05em;
  transition: border-color .25s var(--ease), background-color .25s var(--ease),
    color .25s var(--ease), transform .25s var(--ease);
}

.site-nav__link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .08em;
  color: var(--muted);
  transition: color .25s var(--ease);
}

.site-nav__link:hover {
  border-color: var(--hair-strong);
  background: rgba(215, 225, 234, .06);
  transform: translateY(-1px);
}

.site-nav__link:hover::before { color: var(--link); }

.site-nav__link[aria-current="page"] {
  border-color: var(--signal);
  background: var(--signal-soft);
  color: var(--paper);
}

.site-nav__link[aria-current="page"]::before { color: var(--signal); }

/* 5. 页脚 ------------------------------------------------------------------ */
.site-footer {
  margin-top: clamp(3rem, 7vw, 6rem);
  background: linear-gradient(180deg, #081C2F 0%, var(--ink) 100%);
  border-top: 1px solid var(--hair-strong);
}

.site-footer__inner {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr) minmax(0, 1.1fr);
  gap: clamp(1.75rem, 4vw, 3.25rem);
}

.site-footer__mast {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .5rem;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: .12em;
  color: var(--paper);
}

.site-footer__line {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .42em;
  text-indent: .42em;
  text-transform: uppercase;
  color: var(--signal);
}

.site-footer__rev {
  margin-top: .45rem;
  display: inline-flex;
  padding: .28rem .75rem;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .14em;
  color: var(--muted);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2rem);
}

.site-footer__group { min-width: 0; }

.site-footer__title {
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .66rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--signal);
}

.site-footer__list { display: grid; gap: .55rem; }
.site-footer__list--data { gap: .85rem; }

.site-footer__link {
  font-size: .94rem;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.site-footer__link:hover {
  color: var(--link);
  border-bottom-color: rgba(91, 192, 235, .5);
}

.site-footer__key {
  display: block;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-footer__val {
  display: block;
  font-size: .94rem;
  color: var(--paper);
  word-break: break-word;
}

.site-footer__note {
  margin-top: 1rem;
  max-width: 36ch;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--muted);
}

.site-footer__base { border-top: 1px solid var(--hair); }

.site-footer__base-inner {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: 1.1rem 1.4rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.site-footer__copy,
.site-footer__icp { color: var(--muted); }

/* 6. 通用布局与组件 -------------------------------------------------------- */
.shell {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
}

.band { padding-block: clamp(2.5rem, 6vw, 5rem); }

.band--command {
  background: linear-gradient(180deg, rgba(18, 58, 90, .55), rgba(11, 31, 51, 0));
  border-block: 1px solid var(--hair);
}

.band--paper { background: var(--paper); color: var(--ink); }
.band--paper h1,
.band--paper h2,
.band--paper h3,
.band--paper h4 { color: var(--ink); }

.rule {
  height: 1px;
  border: 0;
  background: var(--hair-strong);
  margin-block: clamp(1.5rem, 4vw, 3rem);
}

.section { display: block; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  padding-bottom: 1rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  border-bottom: 1px solid var(--hair);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: .04em;
  color: var(--paper);
}

.section__note {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.band--paper .section__head { border-bottom-color: rgba(5, 10, 15, .12); }
.band--paper .section__note { color: rgba(5, 10, 15, .55); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--signal);
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 26px;
  height: 1px;
  background: var(--signal);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .25rem .7rem;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.tag--signal {
  color: #ffd9c6;
  border-color: rgba(255, 106, 42, .55);
  background: var(--signal-soft);
}

.tag--live {
  color: #c9f7de;
  border-color: rgba(46, 212, 122, .45);
  background: rgba(46, 212, 122, .1);
}

.tag--amber {
  color: #ffe7b8;
  border-color: rgba(242, 184, 75, .45);
  background: rgba(242, 184, 75, .1);
}

.tag--muted { color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.4rem;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-pill);
  background: rgba(215, 225, 234, .04);
  color: var(--silver);
  font-size: .92rem;
  font-weight: 600;
  letter-spacing: .06em;
  transition: background-color .25s var(--ease), border-color .25s var(--ease),
    color .25s var(--ease), transform .25s var(--ease);
}

.btn:hover {
  border-color: var(--silver);
  background: rgba(215, 225, 234, .1);
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: #1b0a02;
}

.btn--primary:hover {
  background: #ff8348;
  border-color: #ff8348;
  color: #1b0a02;
}

.btn--ghost { background: transparent; }

.btn--quiet {
  padding: .4rem .6rem;
  border-color: transparent;
  background: transparent;
  color: var(--link);
  font-weight: 500;
}

.btn--quiet:hover {
  border-color: transparent;
  background: transparent;
  color: var(--signal);
}

.grid { display: grid; gap: clamp(1rem, 2.2vw, 1.75rem); }
.grid--split { grid-template-columns: minmax(0, 1.6fr) minmax(0, .9fr); }
.grid--index { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

.panel {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 2.6vw, 2rem);
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(18, 58, 90, .78) 0%, rgba(11, 31, 51, .94) 100%);
  box-shadow: var(--shadow-panel);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .6rem 1rem;
  margin-bottom: 1rem;
}

.panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: .05em;
  color: var(--paper);
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, #123A5A 0%, #071522 100%);
}

.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.68) contrast(1.08) brightness(.92);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(215, 225, 234, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(215, 225, 234, .07) 1px, transparent 1px);
  background-size: 38px 38px;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 1.6rem 1.1rem .85rem;
  background: linear-gradient(180deg, transparent, rgba(5, 10, 15, .88));
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--silver);
}

.prose {
  max-width: 70ch;
  color: var(--silver);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 { margin-top: 2.2em; font-size: clamp(1.35rem, 2.6vw, 1.85rem); }
.prose h3 { margin-top: 1.8em; font-size: clamp(1.1rem, 2vw, 1.35rem); }

.prose ul {
  display: grid;
  gap: .5em;
  padding-left: 1.1em;
}

.prose ul li { position: relative; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: -1.1em;
  top: .8em;
  width: 8px;
  height: 1px;
  background: var(--signal);
}

.prose a {
  color: var(--link);
  border-bottom: 1px solid rgba(91, 192, 235, .4);
}

.prose a:hover {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.prose--paper { color: rgba(5, 10, 15, .82); }
.prose--paper h2,
.prose--paper h3 { color: var(--ink); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: .5rem; }
.breadcrumbs__sep { color: var(--hair-strong); }
.breadcrumbs__link { color: var(--link); }
.breadcrumbs__link:hover { color: var(--signal); }
.breadcrumbs__current { color: var(--silver); }

/* 7. 固定层：读取进度与返回顶部 -------------------------------------------- */
.site-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  height: 2px;
  pointer-events: none;
  background: rgba(215, 225, 234, .08);
}

.site-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--link), var(--signal));
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1rem;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-pill);
  background: rgba(11, 31, 51, .94);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  box-shadow: var(--shadow-panel);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease),
    border-color .25s var(--ease), color .25s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover {
  border-color: var(--signal);
  color: var(--paper);
}

.to-top__icon { color: var(--signal); }

/* 8. 滚动显现 -------------------------------------------------------------- */
html[data-js] [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

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

/* 9. 响应式 ---------------------------------------------------------------- */
@media (max-width: 1080px) {
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .site-footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .site-footer__contact { grid-column: 1 / -1; }
  .site-footer__note { max-width: 60ch; }
}

@media (max-width: 880px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "identity end"
      "start start";
    row-gap: .9rem;
    padding-block: 1.15rem .95rem;
  }

  .masthead__identity { text-align: left; }
  .masthead__brand { align-items: flex-start; }
  .masthead__name { font-size: clamp(1.3rem, 6vw, 1.8rem); letter-spacing: .1em; text-indent: .1em; }
  .masthead__line { letter-spacing: .36em; text-indent: .36em; }
  .masthead__rail--start { width: 100%; }
  .masthead__meta--rev { display: none; }

  html[data-js] .nav-toggle { display: inline-flex; }

  html[data-js] .site-nav {
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    border-top: 1px solid transparent;
    transition: max-height .38s var(--ease), visibility .38s var(--ease),
      border-color .38s var(--ease);
  }

  html[data-js] .site-nav[data-open] {
    max-height: 36rem;
    visibility: visible;
    border-top-color: var(--hair);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: .15rem;
    padding: .7rem 0 1rem;
  }

  .site-nav__link {
    justify-content: flex-start;
    padding: .8rem 1rem;
    border-radius: 14px;
    font-size: 1rem;
  }
}

@media (max-width: 680px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__contact { grid-column: auto; }
  .site-footer__base-inner { flex-direction: column; align-items: flex-start; gap: .35rem; }
}

@media (max-width: 560px) {
  .masthead__cta { display: none; }
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); }
  .media-frame { border-radius: var(--radius-md); }
}

/* 10. 动效偏好 ------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .pulse { animation: none; }
}