/* 星空中国 · 全站共享样式 /assets/site.css */

:root {
  --container: 1200px;
  --radius: 1rem;
  --radius-sm: .5rem;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-condensed: "Oswald", "DIN Condensed", "Bahnschrift Condensed", "Roboto Condensed", "Arial Narrow", "Noto Sans SC", "PingFang SC", sans-serif;
  --color-bg: #0B0C10;
  --color-bg-deep: #1F2833;
  --color-bg-overlay: #12161D;
  --color-accent: #00FF9C;
  --color-silver: #C5C6C7;
  --color-info: #4D9FFF;
  --color-warning: #FF6B35;
  --color-text: #F0F0F0;
  --color-muted: #A0AAB2;
  --color-line: rgba(197,198,199,.14);
  --color-line-accent: rgba(0,255,156,.24);
  --shadow-float: 0 8px 32px rgba(0,0,0,.35);
  --space-xs: .5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(1.5px 1.5px at 18% 22%, rgba(197,198,199,.35), transparent 60%),
    radial-gradient(1px 1px at 72% 18%, rgba(197,198,199,.22), transparent 60%),
    radial-gradient(1px 1px at 88% 62%, rgba(0,255,156,.18), transparent 60%),
    radial-gradient(1.5px 1.5px at 38% 78%, rgba(197,198,199,.2), transparent 60%),
    radial-gradient(1px 1px at 8% 88%, rgba(77,159,255,.2), transparent 60%);
  background-repeat: no-repeat;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

[id] {
  scroll-margin-top: 6rem;
}

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

p {
  margin: 0 0 1em;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .55em;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  text-wrap: balance;
}

ul[class], ol[class] {
  margin: 0;
  padding: 0;
  list-style: none;
}

a, button {
  transition: color .22s ease, background-color .22s ease, border-color .22s ease, box-shadow .22s ease, transform .22s ease, opacity .22s ease;
}

::selection {
  background: var(--color-accent);
  color: #0B0C10;
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 无障碍辅助 */
.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 300;
  display: inline-block;
  padding: .75rem 1.25rem;
  border-radius: 999px;
  background: var(--color-accent);
  color: #0B0C10;
  font-weight: 700;
  font-size: .875rem;
  text-decoration: none;
  pointer-events: auto;
  transition: top .2s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 1rem;
  outline: 3px solid var(--color-text);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 主内容与页面容器 */
#main-content {
  flex: 1 0 auto;
  width: 100%;
  min-height: 65vh;
  padding-top: 7rem;
  outline: none;
}

.page-container {
  width: min(var(--container), 100% - 2rem);
  margin-inline: auto;
}

.section {
  padding-block: var(--space-xl);
}

.section--tight {
  padding-block: var(--space-lg);
}

.section-title {
  position: relative;
  margin: 0 0 .4em;
  padding-left: .55em;
  font-family: var(--font-condensed);
  font-size: clamp(2rem, 4vw + .75rem, 3.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: .02em;
  color: var(--color-text);
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .18em;
  bottom: .18em;
  width: .17em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-info));
  box-shadow: 0 0 12px rgba(0,255,156,.35);
}

.section-subtitle {
  margin: 0 0 1.5em;
  max-width: 56ch;
  color: var(--color-muted);
  font-size: 1.0625rem;
  line-height: 1.6;
}

/* 头部浮岛 */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  pointer-events: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .625rem;
  padding: .5rem 1rem;
  border-radius: 999px;
  background: rgba(18,22,29,.72);
  border: 1px solid rgba(197,198,199,.16);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-float);
  text-decoration: none;
  color: var(--color-text);
  pointer-events: auto;
  transition: border-color .25s ease, box-shadow .25s ease;
}

.brand:hover {
  border-color: rgba(0,255,156,.4);
  box-shadow: 0 0 0 1px rgba(0,255,156,.1), var(--shadow-float);
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: 0 0 auto;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-info) 100%);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  animation: starPulse 4s ease-in-out infinite;
}

@keyframes starPulse {
  0%, 100% { filter: drop-shadow(0 0 4px rgba(0,255,156,.4)); }
  50% { filter: drop-shadow(0 0 12px rgba(0,255,156,.7)); }
}

.brand-name {
  font-family: var(--font-condensed);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  white-space: nowrap;
}

.brand-tagline {
  padding-left: .625rem;
  border-left: 1px solid rgba(197,198,199,.22);
  color: var(--color-accent);
  font-size: .6875rem;
  line-height: 1.25;
  letter-spacing: .1em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  padding: .375rem;
  border-radius: 999px;
  background: rgba(18,22,29,.8);
  border: 1px solid rgba(0,255,156,.14);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-float);
  pointer-events: auto;
}

.site-nav a {
  display: inline-block;
  padding: .5rem .875rem;
  border-radius: 999px;
  color: var(--color-silver);
  font-size: .875rem;
  font-weight: 500;
  white-space: nowrap;
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  transition: color .25s ease, background-color .25s ease, box-shadow .25s ease, text-shadow .25s ease;
}

.site-nav a:hover {
  color: var(--color-text);
  background: rgba(0,255,156,.09);
  text-shadow: 0 0 14px rgba(0,255,156,.35);
}

.site-nav a[aria-current="page"] {
  color: #0B0C10;
  background: var(--color-accent);
  font-weight: 600;
  box-shadow: 0 0 14px rgba(0,255,156,.35);
  text-shadow: none;
}

.site-nav a[aria-current="page"]:focus-visible {
  outline-color: var(--color-text);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(18,22,29,.8);
  border: 1px solid rgba(0,255,156,.22);
  cursor: pointer;
  pointer-events: auto;
  transition: background-color .25s ease, border-color .25s ease;
}

.nav-toggle:hover {
  background: rgba(0,255,156,.12);
  border-color: var(--color-accent);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
  transition: transform .3s ease, opacity .3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 页脚 */
.site-footer {
  position: relative;
  flex-shrink: 0;
  margin-top: var(--space-xl);
  background:
    radial-gradient(55% 70% at 85% 0%, rgba(0,255,156,.06), transparent 70%),
    linear-gradient(180deg, var(--color-bg-deep), #08090C 90%);
  border-top: 1px solid rgba(0,255,156,.16);
}

.footer-topline {
  height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--color-accent) 30%, var(--color-info) 70%, transparent 100%);
  opacity: .8;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.35fr;
  gap: 3rem;
  max-width: var(--container);
  margin-inline: auto;
  padding: 4rem 1.5rem 2.5rem;
}

.footer-brand-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.brand--footer {
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
}

.brand--footer:hover {
  box-shadow: none;
}

.brand--footer:hover .brand-name {
  color: var(--color-accent);
}

.footer-slogan {
  margin: 0;
  font-family: var(--font-condensed);
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: .05em;
  color: var(--color-accent);
}

.footer-note {
  margin: 0;
  max-width: 40ch;
  color: var(--color-muted);
  font-size: .875rem;
  line-height: 1.75;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-heading {
  margin: 0;
  padding-bottom: .5rem;
  border-bottom: 1px solid rgba(0,255,156,.2);
  font-family: var(--font-condensed);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-silver);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: .625rem;
}

.footer-list a {
  color: var(--color-silver);
  font-size: .9375rem;
  text-decoration: none;
  transition: color .2s ease, padding-left .2s ease;
}

.footer-list a:hover {
  color: var(--color-accent);
  padding-left: .25rem;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: .625rem;
  margin: 0;
  font-style: normal;
  color: var(--color-muted);
  font-size: .875rem;
  line-height: 1.55;
}

.footer-contact-list span {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.footer-contact-list span::before {
  content: "";
  width: .375rem;
  height: .375rem;
  flex: 0 0 auto;
  border-radius: 1px;
  background: var(--color-accent);
  box-shadow: 0 0 8px rgba(0,255,156,.6);
}

.footer-bottom {
  border-top: 1px solid rgba(197,198,199,.1);
  background: rgba(0,0,0,.28);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  max-width: var(--container);
  margin-inline: auto;
  padding: 1.25rem 1.5rem;
  color: var(--color-muted);
  font-size: .8125rem;
  font-variant-numeric: tabular-nums;
}

.footer-bottom-inner p {
  margin: 0;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.375rem;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: .9375rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color .25s ease, color .25s ease, border-color .25s ease, box-shadow .25s ease, transform .2s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: #0B0C10;
}

.btn-primary:hover {
  background: #6BFFC0;
  box-shadow: 0 0 28px rgba(0,255,156,.4);
  transform: translateY(-2px);
}

.btn-primary:focus-visible {
  outline-color: var(--color-text);
}

.btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: rgba(0,255,156,.5);
}

.btn-ghost:hover {
  background: rgba(0,255,156,.1);
  box-shadow: 0 0 20px rgba(0,255,156,.2);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .375rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .8125rem;
  color: var(--color-muted);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: .375rem;
  color: #3A4450;
}

.breadcrumb a {
  color: var(--color-silver);
  text-decoration: none;
  transition: color .2s ease;
}

.breadcrumb a:hover {
  color: var(--color-accent);
}

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

/* 卡片与标签 */
.card {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
  background: linear-gradient(135deg, rgba(31,40,51,.9), rgba(18,22,29,.9));
  transition: border-color .3s ease, box-shadow .3s ease;
}

.card:hover {
  border-color: rgba(0,255,156,.35);
  box-shadow: 0 10px 40px rgba(0,0,0,.35), 0 0 0 1px rgba(0,255,156,.12);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .25rem .75rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .04em;
  background: rgba(0,255,156,.1);
  color: var(--color-accent);
  border: 1px solid rgba(0,255,156,.22);
}

.tag--info {
  background: rgba(77,159,255,.1);
  color: var(--color-info);
  border-color: rgba(77,159,255,.25);
}

.tag--warn {
  background: rgba(255,107,53,.1);
  color: var(--color-warning);
  border-color: rgba(255,107,53,.25);
}

/* 网格 */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

/* 分隔线与数据 */
.divider {
  height: 1px;
  margin: var(--space-lg) 0;
  border: none;
  background: linear-gradient(90deg, transparent, rgba(197,198,199,.22), transparent);
}

.data-number {
  font-family: var(--font-condensed);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .01em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

/* 长文排版 */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-silver);
}

.prose p + p {
  margin-top: 1.25em;
}

.prose h2 {
  margin: 2em 0 .5em;
  font-family: var(--font-condensed);
  font-size: 2rem;
  color: var(--color-text);
}

.prose h3 {
  margin: 1.5em 0 .5em;
  font-size: 1.25rem;
  color: var(--color-text);
}

.prose a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(0,255,156,.3);
  transition: border-color .2s ease;
}

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

.prose ul,
.prose ol {
  margin: 1em 0;
  padding-left: 1.5em;
}

.prose li {
  margin: .5em 0;
}

.prose strong {
  color: var(--color-text);
}

.prose blockquote {
  margin: 1.5em 0;
  padding: .75rem 1rem;
  border-left: 3px solid var(--color-accent);
  background: rgba(0,255,156,.04);
  color: var(--color-muted);
}

/* 图片与媒体 */
.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  padding: 1.5rem;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  border: 1px dashed rgba(197,198,199,.24);
  background:
    linear-gradient(135deg, rgba(0,255,156,.06) 25%, transparent 25%) 0 0 / 26px 26px,
    linear-gradient(315deg, rgba(77,159,255,.06) 25%, transparent 25%) 0 0 / 26px 26px,
    radial-gradient(80% 60% at 70% 20%, rgba(0,255,156,.05), transparent 60%),
    var(--color-bg-deep);
  color: var(--color-muted);
  font-size: .8125rem;
  letter-spacing: .06em;
  text-align: center;
}

.media {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-bg-deep);
}

.media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 数据表格 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-bg-deep);
}

.data-table th,
.data-table td {
  padding: .75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
  font-variant-numeric: tabular-nums;
}

.data-table th {
  background: rgba(0,255,156,.05);
  color: var(--color-muted);
  font-size: .8125rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.data-table tr:last-child td {
  border-bottom: none;
}

/* 滚动进度与返回顶部 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-info) 60%, var(--color-accent));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: none;
  background: var(--color-accent);
  color: #0B0C10;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 22px rgba(0,255,156,.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease, box-shadow .25s ease;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: 0 6px 30px rgba(0,255,156,.55);
}

.back-to-top:focus-visible {
  outline-color: var(--color-text);
}

/* 响应式 */
@media (max-width: 960px) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

  .footer-brand-block {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .site-header {
    padding: .75rem 1rem;
  }

  .brand-tagline {
    display: none;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + .5rem);
    right: 0;
    min-width: 260px;
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
    padding: .5rem;
    border-radius: 1.25rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(.98);
    transition: opacity .28s ease, transform .28s ease, visibility .28s ease;
  }

  .site-nav a {
    padding: .75rem 1rem;
    border-radius: .75rem;
    font-size: .9375rem;
    text-align: center;
  }

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

  #main-content {
    padding-top: 5.5rem;
  }
}

@media (max-width: 640px) {
  .section {
    padding-block: var(--space-lg);
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.25rem 2rem;
  }

  .footer-brand-block {
    grid-column: auto;
  }

  .footer-bottom-inner {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }

  .back-to-top {
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 480px) {
  .brand {
    padding: .375rem .75rem;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-mark {
    width: 1.5rem;
    height: 1.5rem;
  }
}