/* ==========================================================================
   新银河官网 · 共享样式 /assets/site.css
   银河导航档案：深空底色 + 轨道细线 + 编号秩序
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote, ul, ol, dl, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩：深空底 / 星云深蓝 / 轨道蓝 / 银河紫 / 电光青 / 暖白 / 雾灰蓝 / 星点金 / 星云酒红 / 墨青绿 */
  --ink: #070B18;
  --nebula: #0E1730;
  --orbit: #1C2B4A;
  --violet: #8A5CF6;
  --violet-deep: #7443E4;
  --cyan: #35E0D0;
  --paper: #F2F4F8;
  --mist: #A9B6CC;
  --mist-soft: rgba(169, 182, 204, .68);
  --gold: #E8C46A;
  --wine: #A8305C;
  --pine: #0F3B3F;

  /* 字号阶 48 / 36 / 28 / 22 / 17 / 15 / 13 */
  --fs-xl: 48px;
  --fs-lg: 36px;
  --fs-md: 28px;
  --fs-sm: 22px;
  --fs-body: 17px;
  --fs-aux: 15px;
  --fs-tiny: 13px;

  /* 字体 */
  --font-title: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;

  /* 版式 */
  --wrap: 1240px;
  --gutter: 20px;
  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .22s;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-title);
  font-size: var(--fs-body);
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-title);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.18;
}

h1 { font-size: clamp(30px, 4.4vw, var(--fs-xl)); }
h2 { font-size: clamp(24px, 3vw, var(--fs-lg)); }
h3 { font-size: var(--fs-sm); font-weight: 700; letter-spacing: -.01em; }

p { line-height: 1.75; }

strong, b { font-weight: 700; }

::selection { background: var(--violet); color: #ffffff; }

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.sr-only {
  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;
}

/* 焦点环：全站统一 2px 电光青 */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 4. 布局与通用组件 ---------- */
.wrap {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(48px, 7vw, 88px); }

.grid { display: grid; gap: 24px; }

.grid--12 { display: grid; gap: 24px; }

@media (min-width: 900px) {
  .grid--12 { grid-template-columns: repeat(12, 1fr); gap: 28px; }
}

.stack > * + * { margin-top: 16px; }

.panel {
  background-color: var(--nebula);
  border: 1px solid var(--orbit);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 28px);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  font-weight: 500;
  letter-spacing: .2em;
  line-height: 1.6;
  color: var(--mist);
  text-transform: uppercase;
}

.lede {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--paper);
}

.prose { max-width: 36em; }

.prose p + p { margin-top: 16px; }

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 224, 208, .4);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.note {
  font-size: var(--fs-tiny);
  line-height: 1.8;
  color: var(--mist);
  border-left: 1px solid var(--orbit);
  padding-left: 14px;
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--mist);
  border: 1px solid var(--orbit);
  border-radius: var(--radius);
  padding: 3px 9px;
  line-height: 1.5;
  white-space: nowrap;
}

.tag--gold {
  color: var(--gold);
  border-color: rgba(232, 196, 106, .55);
}

.orbit-line {
  position: relative;
  height: 1px;
  background-color: var(--orbit);
  margin-block: clamp(28px, 4vw, 48px);
}

.orbit-line::before,
.orbit-line::after {
  content: "";
  position: absolute;
  top: -3px;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
}

.orbit-line::before { left: 0; background-color: var(--cyan); }
.orbit-line::after { right: 0; background-color: var(--gold); }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-title);
  font-size: var(--fs-aux);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.4;
  padding: 11px 22px;
  border: 1px solid var(--violet);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--paper);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:hover {
  background-color: var(--violet);
  border-color: var(--violet);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn--primary {
  background-color: var(--violet);
  border-color: var(--violet);
  color: #ffffff;
}

.btn--primary:hover {
  background-color: var(--violet-deep);
  border-color: var(--violet-deep);
}

.btn--ghost {
  border-color: var(--orbit);
  color: var(--mist);
}

.btn--ghost:hover {
  background-color: var(--orbit);
  border-color: var(--orbit);
  color: var(--paper);
}

.btn--line {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--line:hover {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

/* ---------- 6. 面包屑与目录条 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .06em;
  color: var(--mist);
}

.crumbs__sep { color: var(--orbit); }

.crumbs a,
.crumbs__link {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.crumbs a:hover,
.crumbs__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

[data-section-nav] {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  font-family: var(--font-title);
  font-size: var(--fs-aux);
}

[data-section-nav] a {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

[data-section-nav] a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background-color: var(--orbit);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

[data-section-nav] a:hover { color: var(--paper); }
[data-section-nav] a:hover::after { transform: scaleX(1); }

[data-section-nav] a[aria-current] { color: var(--cyan); }
[data-section-nav] a[aria-current]::after {
  transform: scaleX(1);
  background-color: var(--cyan);
}

/* ---------- 7. 图片容器（页面阶段放置占位） ---------- */
.figure {
  margin: 0;
  border: 1px solid var(--orbit);
  border-radius: var(--radius);
  background-color: var(--nebula);
  overflow: hidden;
}

.figure__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(160deg, rgba(14, 23, 48, 1) 0%, rgba(7, 11, 24, 1) 100%);
}

.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 未放图时的抽象轨道占位：无图片也不留空白 */
.figure__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 28% 38%, rgba(53, 224, 208, .6) 0 2.5px, transparent 3px),
    radial-gradient(circle at 72% 66%, rgba(232, 196, 106, .5) 0 2px, transparent 2.5px),
    radial-gradient(circle at 52% 20%, rgba(138, 92, 246, .55) 0 2px, transparent 2.5px),
    repeating-linear-gradient(90deg, rgba(28, 43, 74, .85) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(28, 43, 74, .55) 0 1px, transparent 1px 46px),
    linear-gradient(transparent 49.7%, rgba(28, 43, 74, .95) 49.7% 50.3%, transparent 50.3%);
}

.figure--wide .figure__frame { aspect-ratio: 21 / 9; }

.figure__cap {
  display: block;
  padding: 10px 14px;
  border-top: 1px solid var(--orbit);
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 12px;
  z-index: 300;
  display: inline-block;
  padding: 10px 18px;
  background-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
  font-size: var(--fs-aux);
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 12px; }

/* ---------- 9. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--ink);
  border-bottom: 1px solid var(--orbit);
}

.site-header__upper {
  background-color: var(--nebula);
  border-bottom: 1px solid var(--orbit);
}

.header-upper__inner {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 8px 0;
  color: var(--paper);
}

.brand__mark {
  position: relative;
  flex: none;
  width: 12px;
  height: 12px;
  background-color: var(--violet);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px solid var(--orbit);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand__name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .1em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .12em;
  color: var(--mist);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: var(--fs-tiny);
  color: var(--mist);
}

.header-tools__ver {
  font-family: var(--font-mono);
  letter-spacing: .08em;
  color: var(--mist);
  white-space: nowrap;
}

.header-tools__ver b {
  font-weight: 500;
  color: var(--gold);
}

.header-tools__link {
  color: var(--mist);
  border-bottom: 1px solid var(--orbit);
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-tools__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.header-cta {
  display: inline-block;
  padding: 6px 15px;
  border: 1px solid var(--violet);
  border-radius: var(--radius);
  color: var(--paper);
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.header-cta:hover {
  background-color: var(--violet);
  color: #ffffff;
}

.site-header__lower { position: relative; }

.header-lower__inner {
  position: relative;
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav { flex: 1 1 auto; min-width: 0; }

.nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0 4px;
}

.nav__item { display: block; }

.nav__link {
  position: relative;
  display: block;
  padding: 16px 15px;
  font-size: var(--fs-aux);
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 0;
  height: 2px;
  background-color: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav__link:hover { color: var(--paper); }
.nav__link:hover::after { transform: scaleX(1); }

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

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--violet);
}

.nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -4px;
  width: 6px;
  height: 6px;
  background-color: var(--gold);
  transform: translateX(-50%) rotate(45deg);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  background-color: transparent;
  border: 1px solid var(--orbit);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-title);
  font-size: var(--fs-tiny);
  font-weight: 700;
  letter-spacing: .12em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 11px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet) 0%, var(--cyan) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 104px);
  background-color: var(--pine);
  border-top: 1px solid var(--orbit);
}

.footer-rail {
  height: 6px;
  background-color: rgba(7, 11, 24, .45);
  background-image: repeating-linear-gradient(90deg, rgba(169, 182, 204, .35) 0 1px, transparent 1px 28px);
  border-bottom: 1px solid var(--orbit);
}

.footer__inner {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding: clamp(40px, 5vw, 60px) 0 clamp(32px, 4vw, 44px);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 640px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1.7fr 1fr 1fr 1.3fr;
    gap: 40px;
  }
}

.footer__brand {
  font-size: var(--fs-sm);
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--paper);
}

.footer__tagline {
  margin-top: 12px;
  max-width: 24em;
  font-size: var(--fs-aux);
  line-height: 1.8;
  color: var(--mist);
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--gold);
  margin-bottom: 14px;
}

.footer__list li + li { margin-top: 9px; }

.footer__link {
  font-size: var(--fs-aux);
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer__contact {
  font-size: var(--fs-aux);
  line-height: 1.9;
  color: var(--mist);
}

.footer__contact p + p { margin-top: 6px; }

.footer__contact-label {
  display: inline-block;
  min-width: 5.5em;
  color: var(--mist-soft);
  font-size: var(--fs-tiny);
  letter-spacing: .08em;
}

.footer__contact .mono {
  color: var(--paper);
  font-size: var(--fs-aux);
}

.footer__note {
  margin-top: 12px;
  font-size: var(--fs-tiny);
  line-height: 1.8;
  color: var(--mist-soft);
}

.footer__legal {
  border-top: 1px solid var(--orbit);
  background-color: rgba(7, 11, 24, .38);
}

.footer__legal-inner {
  width: min(100% - (var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding: 16px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: var(--fs-tiny);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 11. 响应式：移动与平板 ---------- */
@media (max-width: 1023px) {
  .header-tools { gap: 14px; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 100px; }

  .header-upper__inner { min-height: 54px; }
  .header-tools__ver { display: none; }

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

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 90;
    display: none;
    background-color: var(--nebula);
    border-top: 1px solid var(--orbit);
    border-bottom: 1px solid var(--orbit);
    padding: 6px 0 12px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .site-header[data-open] .nav { display: block; }

  .nav__list { flex-direction: column; flex-wrap: nowrap; gap: 0; }

  .nav__link {
    padding: 14px var(--gutter);
    border-bottom: 1px dashed var(--orbit);
  }

  .nav__link::after { left: 0; right: 0; height: 2px; }
  .nav__link::before { display: none; }

  .nav__link[aria-current="page"] {
    color: var(--paper);
    background-color: rgba(138, 92, 246, .14);
  }

  .nav__link[aria-current="page"]::after { transform: scaleX(1); }
}

@media (max-width: 620px) {
  :root { --gutter: 16px; }

  body { font-size: var(--fs-body); }

  .brand { gap: 12px; }
  .brand__name { font-size: 18px; }
  .brand__sub { letter-spacing: .08em; }
  .header-tools__link { display: none; }
  .header-cta { padding: 6px 12px; }

  .footer__contact-label { min-width: 4.6em; }
  .footer__legal-inner { gap: 6px 16px; }
}

/* ---------- 12. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

  .btn:hover { transform: none; }

  .nav__link::after,
  [data-section-nav] a::after,
  .scroll-progress {
    transition: none !important;
  }
}