/* ============================================================
   365平台主 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 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, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
}

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --c-space: #0A1A2F;
  --c-nebula: #3B2A6B;
  --c-indi: #241A4A;
  --c-teal: #0E3B3A;
  --c-wine: #6C1F3B;
  --c-signal: #FF7A33;
  --c-mint: #6FE3B6;
  --c-warm: #F5F1E8;
  --c-fog: #C9D0DC;
  --c-ink: #0B0D12;

  --line-soft: 1px solid rgba(201, 208, 220, 0.18);
  --line-mid: 1px solid rgba(201, 208, 220, 0.34);
  --line-strong: 1px solid rgba(245, 241, 232, 0.55);

  --font-display: "Noto Sans SC", "Space Grotesk", "Helvetica Neue", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --rail-w: 252px;
  --head-h: 76px;
  --gutter: clamp(1.25rem, 3vw, 3rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  background: var(--c-space);
  color: var(--c-warm);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

h1 { font-weight: 200; letter-spacing: -0.02em; }
h2 { font-weight: 300; }
h3, h4 { font-weight: 700; }

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

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

#main-content { scroll-margin-top: calc(var(--head-h) + 12px); }

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  font-variant-numeric: tabular-nums;
}

/* ---------- 4. 页头：侧边轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  padding: 1.4rem 1.25rem 1.5rem;
  background:
    linear-gradient(180deg, rgba(59, 42, 107, 0.92) 0%, rgba(36, 26, 74, 0.94) 34%, var(--c-space) 78%);
  border-right: var(--line-soft);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 12px;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(201, 208, 220, 0.34) 0 1px,
    transparent 1px 14px
  );
  opacity: 0.7;
}

/* skip link */
.skip-link {
  position: absolute;
  left: 0.9rem;
  top: -5rem;
  z-index: 200;
  padding: 0.62rem 1rem;
  background: var(--c-signal);
  color: var(--c-ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  border: 1px solid var(--c-ink);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 0.9rem; }

/* 品牌 */
.header-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex: 0 0 auto;
}

.brand {
  display: grid;
  gap: 0.22rem;
  color: var(--c-warm);
  padding-bottom: 0.9rem;
  border-bottom: var(--line-soft);
  width: 100%;
}

.brand__mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.95rem;
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--c-mint);
  font-variant-numeric: tabular-nums;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.34em;
}

.brand__loc {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  color: rgba(201, 208, 220, 0.7);
}

/* 移动端抽屉按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.7rem;
  background: rgba(36, 26, 74, 0.5);
  border: var(--line-mid);
  color: var(--c-warm);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--c-mint);
  background: rgba(59, 42, 107, 0.7);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: var(--c-warm);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.64rem;
  letter-spacing: 0.2em;
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航 */
.site-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1 1 auto;
  min-height: 0;
}

.site-nav__caption {
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  color: rgba(201, 208, 220, 0.55);
  padding-left: 0.6rem;
}

.site-nav__list { display: grid; gap: 0.12rem; }

.site-nav__item { display: block; }

.site-nav__link {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.6rem 0.5rem 0.6rem 0.6rem;
  border-left: 2px solid transparent;
  color: rgba(245, 241, 232, 0.76);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.94rem;
  letter-spacing: 0.04em;
  transition:
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    background 0.2s var(--ease),
    padding-left 0.2s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--c-warm);
  border-left-color: var(--c-signal);
  background: rgba(59, 42, 107, 0.45);
  padding-left: 0.95rem;
}

.site-nav__link[aria-current="page"] {
  color: var(--c-warm);
  border-left-color: var(--c-mint);
  background: rgba(14, 59, 58, 0.55);
}

.site-nav__no {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: rgba(201, 208, 220, 0.45);
  transition: color 0.2s var(--ease);
}

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

.site-nav__foot {
  margin-top: auto;
  display: grid;
  gap: 0.7rem;
  padding-top: 1rem;
  border-top: var(--line-soft);
}

/* 状态灯 */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: rgba(201, 208, 220, 0.85);
}

.status__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--c-mint);
  box-shadow: 0 0 0 3px rgba(111, 227, 182, 0.16);
  animation: statusPulse 3.4s ease-in-out infinite;
}

.status__text { line-height: 1.4; }

@keyframes statusPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px rgba(111, 227, 182, 0.16); }
  50% { opacity: 0.55; box-shadow: 0 0 0 6px rgba(111, 227, 182, 0.05); }
}

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.1rem;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition:
    background 0.2s var(--ease),
    color 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.btn--signal {
  background: var(--c-signal);
  color: var(--c-ink);
}
.btn--signal:hover,
.btn--signal:focus-visible {
  background: #ff8f52;
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(201, 208, 220, 0.4);
  color: var(--c-warm);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--c-mint);
  color: var(--c-mint);
}

.btn--block { width: 100%; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 7rem);
  padding: clamp(2.5rem, 5vw, 4.5rem) var(--gutter) 2rem;
  background:
    linear-gradient(158deg, var(--c-indi) 0%, var(--c-nebula) 56%, #150F2E 100%);
  border-top: 1px solid rgba(201, 208, 220, 0.26);
  color: var(--c-warm);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(111, 227, 182, 0.55) 0 1px,
    transparent 1px 28px
  );
  opacity: 0.6;
  pointer-events: none;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.9fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  max-width: 1240px;
  margin: 0 auto;
}

.footer-brand {
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.footer-brand__mark {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--c-mint);
}

.footer-brand__line {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: 0.16em;
}

.footer-brand__note {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.7);
  max-width: 30ch;
}

.footer-brand__icp {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: rgba(201, 208, 220, 0.6);
  padding-top: 0.4rem;
  border-top: var(--line-soft);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.footer-col {
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.64rem;
  letter-spacing: 0.24em;
  color: var(--c-signal);
  padding-bottom: 0.6rem;
  border-bottom: var(--line-soft);
}

.footer-list { display: grid; gap: 0.45rem; }

.footer-link {
  display: inline-block;
  font-size: 0.92rem;
  color: rgba(245, 241, 232, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--c-mint);
  border-bottom-color: var(--c-mint);
}

.footer-contact {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(201, 208, 220, 0.78);
  word-break: break-all;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  max-width: 1240px;
  margin: clamp(2rem, 4vw, 3.4rem) auto 0;
  padding-top: 1.2rem;
  border-top: var(--line-soft);
}

.footer-base__copy,
.footer-base__note {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: rgba(201, 208, 220, 0.6);
  line-height: 1.9;
}

/* ---------- 7. 布局与通用组件 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(2.5rem, 6vw, 5.5rem); }
.section--tight { padding-block: clamp(1.75rem, 4vw, 3rem); }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 2rem); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--c-signal);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 0.9rem;
  border-bottom: var(--line-soft);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: rgba(201, 208, 220, 0.58);
}
.breadcrumb a {
  color: rgba(245, 241, 232, 0.8);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--c-mint);
  border-bottom-color: var(--c-mint);
}
.breadcrumb__sep { color: rgba(201, 208, 220, 0.3); }
.breadcrumb [aria-current="page"] { color: var(--c-mint); }

/* 长文 */
.prose {
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.86);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  color: var(--c-warm);
  margin-top: 2em;
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--c-warm);
  margin-top: 1.7em;
}
.prose strong { color: var(--c-warm); font-weight: 700; }
.prose a {
  color: var(--c-mint);
  border-bottom: 1px solid rgba(111, 227, 182, 0.4);
  transition: border-color 0.2s var(--ease);
}
.prose a:hover { border-bottom-color: var(--c-mint); }
.prose ul { display: grid; gap: 0.5rem; padding-left: 1.1rem; }
.prose li { position: relative; }
.prose li::before {
  content: "";
  position: absolute;
  left: -1.1rem;
  top: 0.82em;
  width: 6px;
  height: 1px;
  background: var(--c-signal);
}

/* 图片占位容器 */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  min-height: 180px;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(201, 208, 220, 0.22);
  background:
    radial-gradient(circle at 28% 20%, rgba(59, 42, 107, 0.9), transparent 62%),
    radial-gradient(circle at 78% 82%, rgba(14, 59, 58, 0.85), transparent 60%),
    linear-gradient(150deg, #10203A, var(--c-space) 74%);
}
.img-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 208, 220, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 208, 220, 0.09) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.img-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-frame--star { aspect-ratio: 4 / 5; }
.img-frame--wide { aspect-ratio: 21 / 9; }

/* ---------- 8. JS 生成组件：滚动坐标条 / 回顶 ---------- */
.scroll-track {
  position: fixed;
  top: 0;
  right: 0;
  width: 3px;
  height: 100vh;
  z-index: 70;
  background: rgba(201, 208, 220, 0.1);
  pointer-events: none;
}
.scroll-track__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleY(0);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--c-signal), var(--c-mint));
}

.back-top {
  position: fixed;
  right: clamp(1rem, 2.5vw, 1.75rem);
  bottom: clamp(1rem, 2.5vw, 1.75rem);
  z-index: 75;
  padding: 0.6rem 0.85rem;
  background: rgba(10, 26, 47, 0.88);
  border: 1px solid rgba(201, 208, 220, 0.3);
  color: var(--c-warm);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity 0.24s var(--ease),
    transform 0.24s var(--ease),
    visibility 0.24s linear,
    border-color 0.24s var(--ease),
    color 0.24s var(--ease);
}
.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top:hover,
.back-top:focus-visible {
  border-color: var(--c-mint);
  color: var(--c-mint);
}

/* ---------- 9. 响应式 ---------- */
@media (min-width: 961px) {
  body { padding-left: var(--rail-w); }
}

@media (max-width: 1080px) {
  :root { --rail-w: 224px; }
}

@media (max-width: 960px) {
  body { padding-left: 0; }

  .site-header {
    position: sticky;
    top: 0;
    left: auto;
    right: auto;
    bottom: auto;
    width: 100%;
    height: var(--head-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 var(--gutter);
    border-right: 0;
    border-bottom: var(--line-soft);
    overflow: visible;
    background: linear-gradient(120deg, rgba(36, 26, 74, 0.98), var(--c-space) 72%);
  }

  .site-header::after { display: none; }

  .header-head {
    flex: 1 1 auto;
    align-items: center;
    width: 100%;
    gap: 0.8rem;
  }

  .brand {
    width: auto;
    padding-bottom: 0;
    border-bottom: 0;
    gap: 0.08rem;
  }
  .brand__mark { font-size: 1.2rem; letter-spacing: 0.1em; }
  .brand__name { font-size: 0.72rem; letter-spacing: 0.26em; }
  .brand__loc { font-size: 0.55rem; letter-spacing: 0.02em; }

  .nav-toggle { display: inline-flex; flex: 0 0 auto; }

  .site-nav {
    position: fixed;
    top: var(--head-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 90;
    flex-direction: column;
    gap: 1.2rem;
    padding: 1.4rem var(--gutter) 2rem;
    background: linear-gradient(180deg, var(--c-indi) 0%, var(--c-space) 72%);
    border-top: var(--line-soft);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
      opacity 0.26s var(--ease),
      transform 0.26s var(--ease),
      visibility 0.26s linear;
  }

  .site-header[data-open="true"] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__caption { padding-left: 0; }
  .site-nav__list { gap: 0.2rem; }
  .site-nav__link {
    grid-template-columns: 2.4rem minmax(0, 1fr);
    font-size: 1.02rem;
    padding: 0.85rem 0.6rem;
    border-left-width: 2px;
  }
  .site-nav__link:hover,
  .site-nav__link:focus-visible { padding-left: 0.95rem; }

  .site-nav__foot { padding-bottom: 1rem; }

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

@media (max-width: 720px) {
  body { font-size: 16px; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 1.6rem; }
  .footer-col__title { padding-bottom: 0.45rem; }
  .grid--split,
  .grid--halves,
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .nav-toggle__label { display: none; }
  .brand__loc { display: none; }
}

/* ---------- 10. 无障碍：减弱动效 ---------- */
@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;
  }
  .status__dot { animation: none; }
  .btn--signal:hover,
  .btn--signal:focus-visible { transform: none; }
  .back-top { transform: none; }
  .back-top.is-visible { transform: none; }
}