/* ============================================================
   银河网 · 共享样式表 /assets/site.css
   深空观测站 × 展览画册
   ============================================================ */

:root {
  --void: #05070F;
  --hull: #0C1224;
  --paper: #121A30;
  --star: #EDF1FA;
  --mist: #A7B0C6;
  --nebula: #7C5CFF;
  --electric: #46E0C8;
  --signal: #FF7A3D;
  --orbit: #2B3554;
  --archive: #5C6684;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --step-6: clamp(2.6rem, 7vw, 5.6rem);
  --step-5: clamp(2.1rem, 4.6vw, 3.2rem);
  --step-4: clamp(1.5rem, 2.8vw, 2rem);
  --step-3: clamp(1.15rem, 1.9vw, 1.35rem);
  --step-2: 1.0625rem;
  --step-1: 0.75rem;

  --page-max: 1240px;
  --gutter: clamp(20px, 4vw, 48px);
  --line: 1px solid var(--orbit);
}

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

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--void);
  color: var(--star);
  font-family: var(--font-sans);
  font-size: var(--step-2);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 星云光晕 + 扫描线底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(920px 560px at 10% -10%, rgba(124, 92, 255, 0.17), transparent 62%),
    radial-gradient(760px 480px at 92% 2%, rgba(70, 224, 200, 0.09), transparent 60%),
    radial-gradient(1200px 720px at 50% 118%, rgba(124, 92, 255, 0.10), transparent 66%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(237, 241, 250, 0.022) 0,
    rgba(237, 241, 250, 0.022) 1px,
    transparent 1px,
    transparent 3px
  );
}

main { display: block; }

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

a {
  color: var(--nebula);
  text-decoration: none;
  transition: color 0.18s ease-out;
}
a:hover { color: var(--electric); }

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

#main-content { scroll-margin-top: 130px; }

::selection {
  background: rgba(124, 92, 255, 0.42);
  color: var(--star);
}

/* ---------- 无障碍跳转 ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--star);
  color: var(--void);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  border-radius: 2px;
  transition: top 0.18s ease-out;
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  color: var(--void);
  outline: 2px solid var(--electric);
  outline-offset: 2px;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(5, 7, 15, 0.94);
  border-bottom: var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.masthead {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(14px, 2.2vw, 24px) var(--gutter) clamp(10px, 1.4vw, 14px);
  text-align: center;
}

.masthead__issue {
  font-size: 0.6875rem;
  line-height: 1.6;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.masthead__row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 2.2vw, 28px);
  margin: 8px 0 10px;
}

.masthead__rule {
  flex: 1 1 auto;
  max-width: 240px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--orbit));
}
.masthead__rule:last-child {
  background: linear-gradient(90deg, var(--orbit), transparent);
}

.masthead__brand {
  flex: 0 0 auto;
  font-size: clamp(1.85rem, 4.4vw, 2.9rem);
  font-weight: 200;
  line-height: 1.05;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--star);
  white-space: nowrap;
  transition: color 0.18s ease-out, text-shadow 0.18s ease-out;
}
.masthead__brand:hover,
.masthead__brand:focus-visible {
  color: var(--star);
  text-shadow: 0 0 26px rgba(124, 92, 255, 0.55);
}
.masthead__brand:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 8px;
}

.masthead__tagline {
  font-size: 0.75rem;
  line-height: 1.7;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  margin: 14px auto 2px;
  padding: 0 20px;
  background: var(--paper);
  border: var(--line);
  border-radius: 2px;
  color: var(--mist);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: border-color 0.18s ease-out, color 0.18s ease-out, background-color 0.18s ease-out;
}
.nav-toggle:hover {
  border-color: var(--nebula);
  color: var(--nebula);
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}
.nav-toggle__label { line-height: 1; }

/* ---------- 栏目索引 ---------- */
.site-nav {
  border-top: var(--line);
  background: linear-gradient(180deg, rgba(12, 18, 36, 0.72), rgba(5, 7, 15, 0));
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(6px, 2.2vw, 32px);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 15px 6px 14px;
  color: var(--mist);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-decoration: none;
  transition: color 0.18s ease-out;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 10px;
  height: 1px;
  background: var(--nebula);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s ease-out, background-color 0.18s ease-out;
}
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--star);
  text-decoration: none;
}
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }

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

/* ---------- 滚动进度轨道 ---------- */
.scroll-rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(43, 53, 84, 0.55);
  pointer-events: none;
}
.scroll-rail__fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--nebula), var(--electric));
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: var(--hull);
  border-top: var(--line);
  color: var(--mist);
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  height: 1px;
  background: var(--orbit);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr);
  gap: clamp(28px, 5vw, 64px);
  max-width: var(--page-max);
  margin: 0 auto;
  padding: clamp(38px, 6vw, 70px) var(--gutter) clamp(26px, 4vw, 40px);
}

.site-footer__brand {
  display: grid;
  align-content: start;
  gap: 14px;
}

.site-footer__brand-line {
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  font-weight: 300;
  line-height: 1.45;
  letter-spacing: 0.1em;
  color: var(--star);
}

.site-footer__note {
  max-width: 28em;
  font-size: 0.8125rem;
  line-height: 1.85;
  color: var(--archive);
}

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}

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

.site-footer__col-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: var(--line);
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  color: var(--archive);
}

.site-footer__links {
  display: grid;
  gap: 9px;
}

.site-footer__link {
  display: inline-block;
  color: var(--mist);
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  transition: color 0.18s ease-out, transform 0.18s ease-out;
}
.site-footer__link:hover,
.site-footer__link:focus-visible {
  color: var(--star);
  transform: translateX(3px);
}

.site-footer__meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 28px;
  margin-top: clamp(6px, 1.6vw, 14px);
  padding-top: 22px;
  border-top: var(--line);
  font-size: 0.75rem;
  line-height: 1.8;
  letter-spacing: 0.06em;
  color: var(--archive);
}

.site-footer__contact {
  flex: 1 1 340px;
  color: var(--mist);
}

.site-footer__icp {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.site-footer__copyright {
  color: var(--archive);
}

/* ---------- 版式容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.prose {
  max-width: 34em;
  font-size: var(--step-2);
  line-height: 1.8;
  color: var(--mist);
}
.prose > * + * { margin-top: 1.15em; }
.prose h2 {
  margin-top: 2.1em;
  font-size: var(--step-4);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--star);
}
.prose h3 {
  margin-top: 1.9em;
  font-size: var(--step-3);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--star);
}
.prose strong { color: var(--star); font-weight: 500; }
.prose a {
  color: var(--electric);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
}
.prose ul,
.prose ol { padding-left: 1.4em; }
.prose ul { list-style: none; }
.prose ul > li { position: relative; }
.prose ul > li::before {
  content: "";
  position: absolute;
  left: -1em;
  top: 0.8em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--nebula);
}
.prose ol { list-style: decimal; }
.prose ol > li::marker {
  color: var(--nebula);
  font-family: var(--font-mono);
  font-size: 0.85em;
}
.prose code {
  padding: 0.1em 0.42em;
  border-radius: 1px;
  background: rgba(43, 53, 84, 0.6);
  color: var(--star);
  font-family: var(--font-mono);
  font-size: 0.88em;
  letter-spacing: 0.02em;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9375em;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--star);
}

.index-tag {
  display: inline-block;
  font-size: 0.6875rem;
  line-height: 1.7;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

.rule {
  height: 0;
  margin: 0;
  border: 0;
  border-top: var(--line);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 22px;
  border: var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--star);
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease-out, border-color 0.18s ease-out,
    color 0.18s ease-out, background-color 0.18s ease-out;
}
.btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
}
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--nebula);
  border-color: var(--nebula);
  color: #08060f;
  font-weight: 600;
}
.btn--primary:hover {
  background: #8f74ff;
  border-color: #8f74ff;
  color: #05070f;
}

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

.btn--signal {
  border-color: rgba(255, 122, 61, 0.7);
  color: var(--signal);
}
.btn--signal:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: #12070a;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: clamp(18px, 3vw, 32px) 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--archive);
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
}
.breadcrumb__link:hover { color: var(--nebula); }
.breadcrumb__sep {
  color: var(--orbit);
  font-family: var(--font-mono);
}
.breadcrumb__current { color: var(--star); }

/* ---------- 章节头 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 26px;
  margin-bottom: clamp(20px, 3vw, 34px);
  padding-bottom: 14px;
  border-bottom: var(--line);
}
.section-head__title {
  font-size: var(--step-4);
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--star);
}
.section-head__hint {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--archive);
}

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: var(--line);
  border-radius: 1px;
  background: rgba(18, 26, 48, 0.72);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1.7;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tag--live {
  color: var(--electric);
  border-color: rgba(70, 224, 200, 0.4);
  background: rgba(70, 224, 200, 0.07);
}
.tag--signal {
  color: var(--signal);
  border-color: rgba(255, 122, 61, 0.42);
  background: rgba(255, 122, 61, 0.08);
}
.tag--nebula {
  color: var(--nebula);
  border-color: rgba(124, 92, 255, 0.44);
  background: rgba(124, 92, 255, 0.09);
}
.tag--muted {
  color: var(--archive);
  border-color: rgba(92, 102, 132, 0.42);
  background: rgba(92, 102, 132, 0.08);
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--electric);
  box-shadow: 0 0 0 3px rgba(70, 224, 200, 0.16);
  vertical-align: middle;
}
.status-dot--signal {
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 122, 61, 0.16);
}
.status-dot--muted {
  background: var(--archive);
  box-shadow: none;
}

/* ---------- 档案卡 ---------- */
.card {
  position: relative;
  display: block;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--paper);
  border: var(--line);
  border-radius: 2px;
  color: inherit;
  transition: transform 0.18s ease-out, border-color 0.18s ease-out,
    box-shadow 0.18s ease-out;
}
.card::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(43, 53, 84, 0.5);
  pointer-events: none;
}
.card:hover,
.card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(124, 92, 255, 0.6);
  box-shadow: 0 20px 36px -24px rgba(0, 0, 0, 0.95);
}

.card--stack {
  box-shadow: 6px 6px 0 -1px var(--void), 7px 7px 0 -1px var(--orbit);
}
.card--stack:hover,
.card--stack:focus-visible {
  box-shadow: 8px 10px 0 -1px var(--void), 9px 11px 0 -1px var(--orbit),
    0 20px 36px -24px rgba(0, 0, 0, 0.95);
}

.card__title {
  position: relative;
  font-size: var(--step-3);
  font-weight: 400;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--star);
}
.card__meta {
  position: relative;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--archive);
}

a.card { text-decoration: none; }
a.card:hover .card__title { color: var(--star); }

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: var(--line);
  border-radius: 2px;
  background: linear-gradient(158deg, #0a1020 0%, #111934 55%, #080d19 100%);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(43, 53, 84, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 53, 84, 0.5) 1px, transparent 1px),
    radial-gradient(58% 68% at 28% 22%, rgba(124, 92, 255, 0.24), transparent 70%),
    radial-gradient(52% 62% at 84% 80%, rgba(70, 224, 200, 0.15), transparent 70%);
  background-size: 48px 48px, 48px 48px, cover, cover;
}
.media-frame__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--archive);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 4 / 5; }

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.6vw, 30px);
}
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 入场 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.42s ease-out, transform 0.42s ease-out;
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1040px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 860px) {
  .masthead { padding-bottom: 16px; }
  .masthead__row {
    margin: 6px 0 10px;
    gap: 14px;
  }
  .masthead__rule { display: none; }
  .masthead__brand {
    font-size: clamp(1.7rem, 7.4vw, 2.2rem);
    letter-spacing: 0.26em;
    text-indent: 0.26em;
  }
  .masthead__issue { letter-spacing: 0.16em; }
  .masthead__tagline { letter-spacing: 0.14em; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background: var(--hull);
    border-top: var(--line);
    border-bottom: var(--line);
    box-shadow: 0 30px 48px -26px rgba(0, 0, 0, 0.95);
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav[data-open="false"] { display: none; }
  .site-nav[data-open="true"] { display: block; }

  .site-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding: 6px var(--gutter) 18px;
  }
  .site-nav__list > li + li { border-top: 1px solid rgba(43, 53, 84, 0.55); }
  .site-nav__link {
    padding: 15px 2px;
    font-size: 0.9375rem;
    letter-spacing: 0.14em;
  }
  .site-nav__link::after {
    left: 2px;
    right: auto;
    width: 0;
    bottom: 9px;
    transform: none;
    transition: width 0.18s ease-out;
  }
  .site-nav__link:hover::after,
  .site-nav__link:focus-visible::after,
  .site-nav__link[aria-current="page"]::after {
    transform: none;
    width: 22px;
  }

  .site-footer__columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__meta { flex-direction: column; align-items: flex-start; gap: 8px; }
  .site-footer__contact { flex: 0 0 auto; }

  #main-content { scroll-margin-top: 180px; }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }

  .site-footer__columns { grid-template-columns: minmax(0, 1fr); }
  .site-footer__brand-line { letter-spacing: 0.06em; }
  .btn { width: 100%; }
}

/* ---------- 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;
  }

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

  .card:hover,
  .card:focus-visible,
  .btn:hover,
  .site-footer__link:hover {
    transform: none;
  }

  .scroll-rail__fill { transition: none; }
}