:root {
  --ink-900: #06101F;
  --ink-800: #0B1B30;
  --ink-700: #122A45;
  --line: #1E3A56;
  --cyan: #28D3C4;
  --cyan-deep: #0E8F89;
  --yellow: #F6C453;
  --yellow-hi: #FFD473;
  --paper: #F2F6FA;
  --silver: #9FB0C3;
  --coral: #FF7A6B;

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

  --wrap: 1240px;
  --r-lg: 20px;
  --r-md: 14px;
  --r-pill: 999px;
  --shell-pad: 1.25rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 7.5rem;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(52rem 30rem at 84% -6%, rgba(40, 211, 196, .11), transparent 68%),
    radial-gradient(44rem 26rem at 2% 1%, rgba(246, 196, 83, .07), transparent 66%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .045em;
  margin: 0 0 .6em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 2.9vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.45rem); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--paper); }

ul, ol { margin: 0 0 1em; padding-left: 1.25em; }

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

button { font: inherit; }

hr { border: 0; }

:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 3px;
  border-radius: 4px;
}

.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;
}

/* ---------- 通用容器与排版 ---------- */
.wrap {
  width: min(calc(100% - var(--shell-pad) * 2), var(--wrap));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(calc(100% - var(--shell-pad) * 2), 860px);
  margin-inline: auto;
}

.section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }

.section-head { margin-bottom: clamp(1.2rem, 2.4vw, 2rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 .9rem;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.06;
  font-size: clamp(2.6rem, 7vw, 5.4rem);
  margin: 0 0 .4em;
}

.lede {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.8;
  color: var(--silver);
  max-width: 60ch;
}

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

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

.rule {
  height: 1px;
  border: 0;
  margin: clamp(1.5rem, 3vw, 2.5rem) 0;
  background: linear-gradient(90deg, var(--line), transparent);
}

.prose { max-width: 68ch; line-height: 1.8; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { color: var(--silver); }

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .68rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .18s ease;
}

.btn-primary {
  background: var(--yellow);
  color: #1A1305;
}

.btn-primary:hover {
  background: var(--yellow-hi);
  color: #1A1305;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(40, 211, 196, .08);
}

.btn:active { transform: translateY(1px); }

/* ---------- 标签 / 数据 / 卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .24rem .68rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--silver);
  line-height: 1.5;
}

.tag--round {
  font-family: var(--font-mono);
  color: var(--yellow);
  border-color: rgba(246, 196, 83, .38);
  background: rgba(246, 196, 83, .08);
}

.tag--live {
  color: var(--coral);
  border-color: rgba(255, 122, 107, .4);
  background: rgba(255, 122, 107, .08);
}

.stat { display: grid; gap: .25rem; align-content: start; }

.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--cyan);
}

.stat-label {
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--silver);
}

.card {
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.05rem, 2vw, 1.55rem);
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem 1rem;
  margin-bottom: .9rem;
}

/* ---------- 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 90% at 78% 0%, rgba(40, 211, 196, .16), transparent 62%),
    linear-gradient(160deg, #0E2237 0%, #071527 72%);
}

.media img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--portrait { aspect-ratio: 3 / 4; }

.media-frame {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(40, 211, 196, .12) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(40, 211, 196, .06) 0 1px, transparent 1px 24px);
}

.media::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--yellow), transparent);
  opacity: .6;
}

.media-caption {
  margin-top: .6rem;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--silver);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: .9rem;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--silver);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--line);
}

.breadcrumb a { color: var(--silver); text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan); }

/* ---------- 顶部阅读进度（JS 注入） ---------- */
.read-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 70;
  height: 3px;
  pointer-events: none;
}

.read-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan) 62%, var(--yellow));
  will-change: transform;
}

/* ---------- 滚动入场 ---------- */
[data-reveal] { opacity: 1; transform: none; }

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.2, .7, .3, 1);
}

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

/* ==========================================================
   页头
   ========================================================== */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4.5rem;
  z-index: 100;
  padding: .7rem 1.15rem;
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: var(--yellow);
  color: #1A1305;
  font-weight: 700;
  font-size: .88rem;
  letter-spacing: .06em;
  text-decoration: none;
  transition: top .18s ease;
}

.skip-link:focus { top: 0; color: #1A1305; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(6, 16, 31, .9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(calc(100% - var(--shell-pad) * 2), var(--wrap));
  margin-inline: auto;
}

.header-rail .header-inner {
  display: flex;
  align-items: center;
  gap: 1rem 1.25rem;
  min-height: 64px;
}

.header-nav-rail {
  border-top: 1px solid rgba(30, 58, 86, .75);
  background: linear-gradient(90deg, rgba(11, 27, 48, .92), rgba(6, 16, 31, .5));
}

.header-nav-rail .header-inner {
  display: flex;
  align-items: center;
  min-height: 48px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  flex: none;
  text-decoration: none;
  color: var(--paper);
}

.brand:hover { color: var(--paper); }

.brand-glyph {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 22px;
}

.brand-glyph i {
  display: block;
  width: 4px;
  border-radius: 2px;
  background: var(--cyan);
}

.brand-glyph i:nth-child(1) { height: 10px; opacity: .5; }
.brand-glyph i:nth-child(2) { height: 16px; opacity: .8; }
.brand-glyph i:nth-child(3) { height: 22px; background: var(--yellow); }

.brand-text { display: grid; gap: 1px; }

.brand-name {
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1.25;
}

.brand-tag {
  font-size: .64rem;
  letter-spacing: .2em;
  color: var(--silver);
  line-height: 1.3;
}

/* 状态 */
.header-status {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0;
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--silver);
  white-space: nowrap;
}

.header-status .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(40, 211, 196, .18);
  flex: none;
}

.header-status .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--yellow);
  letter-spacing: .02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-left: auto;
  flex: none;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  padding: .5rem .9rem;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: var(--ink-700);
  color: var(--paper);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .1em;
  cursor: pointer;
  flex: none;
}

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

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform .25s ease, opacity .25s ease;
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* 命令栏导航 */
.site-nav {
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.site-nav::-webkit-scrollbar { display: none; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .5em;
  padding: .6rem .85rem;
  border-radius: var(--r-pill);
  color: var(--silver);
  font-size: .88rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color .2s ease, background-color .2s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: .85rem;
  right: .85rem;
  bottom: .28rem;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s ease;
}

.nav-list a:hover {
  color: var(--paper);
  background: rgba(40, 211, 196, .09);
}

.nav-list a:hover .nav-index { color: var(--cyan); }

.nav-list a[aria-current="page"] {
  color: var(--cyan);
  background: rgba(40, 211, 196, .1);
}

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

.nav-list a[aria-current="page"] .nav-index { color: var(--cyan); }

.nav-index {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .64rem;
  letter-spacing: .1em;
  color: rgba(159, 176, 195, .55);
  transition: color .2s ease;
}

.nav-label { white-space: nowrap; }

.header-tick {
  flex: 1 1 auto;
  height: 14px;
  margin-left: 1.5rem;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 14px);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(90deg, #000 0%, transparent 92%);
  opacity: .8;
  pointer-events: none;
}

/* ==========================================================
   页脚
   ========================================================== */
.site-footer {
  position: relative;
  isolation: isolate;
  margin-top: clamp(3rem, 7vw, 6rem);
  overflow: hidden;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(11, 27, 48, .85), rgba(6, 16, 31, .98)),
    var(--ink-800);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--yellow), transparent);
  opacity: .7;
}

.footer-glow {
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -60%;
  height: 300px;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(40, 211, 196, .16), transparent 72%);
}

.footer-inner {
  position: relative;
  display: grid;
  gap: clamp(1.8rem, 3.2vw, 3rem);
  width: min(calc(100% - var(--shell-pad) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: clamp(2.4rem, 5vw, 3.8rem);
  grid-template-columns: minmax(260px, 1.05fr) minmax(0, 1.5fr) minmax(220px, .95fr);
}

.brand--footer { gap: .6rem; }

.brand--footer .brand-name { font-size: 1.02rem; }

.footer-intro {
  margin: 1rem 0 1.4rem;
  max-width: 34ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--silver);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.6rem;
}

.footer-col-title {
  margin: 0 0 1rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .22em;
  color: var(--cyan);
}

.footer-links {
  display: grid;
  gap: .55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  font-size: .92rem;
  color: var(--silver);
  text-decoration: none;
  transition: color .18s ease, transform .18s ease;
}

.footer-links a:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.footer-contact-list {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-contact-item { display: grid; gap: .15rem; }

.footer-contact-label {
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--silver);
}

.footer-contact-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .86rem;
  letter-spacing: .02em;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1.6rem;
  width: min(calc(100% - var(--shell-pad) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: 1.2rem 1.8rem;
  border-top: 1px solid var(--line);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--silver);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: rgba(159, 176, 195, .88);
}

.footer-copy { margin: 0; }

.footer-note {
  flex-basis: 100%;
  margin: 0;
  font-size: .74rem;
  line-height: 1.7;
  color: rgba(159, 176, 195, .7);
}

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1180px) {
  .header-status { display: none; }
}

@media (max-width: 1023px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .footer-lede { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
  .footer-contact-list { grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
}

@media (max-width: 899px) {
  html { scroll-padding-top: 5.5rem; }

  .header-rail .header-inner { min-height: 58px; }
  .header-actions { display: none; }
  .nav-toggle { display: inline-flex; }

  .header-nav-rail {
    border-top: 0;
    background: none;
  }

  .header-nav-rail .header-inner {
    display: block;
    min-height: 0;
  }

  .header-tick { display: none; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 60;
    padding: .6rem var(--shell-pad) .9rem;
    overflow: visible;
    background: rgba(11, 27, 48, .985);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 22px 44px rgba(0, 0, 0, .5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .22s ease, transform .22s ease, visibility .22s ease;
  }

  .site-header[data-open="true"] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-list a {
    display: flex;
    align-items: center;
    gap: .8em;
    padding: .78rem .9rem;
    border-radius: var(--r-md);
    font-size: .96rem;
  }

  .nav-list a::after {
    left: .9rem;
    right: auto;
    bottom: .5rem;
    width: 26px;
  }

  .nav-index { font-size: .68rem; }
}

@media (max-width: 767px) {
  :root { --shell-pad: 1rem; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { padding-block: 2.2rem 2.6rem; }
  .brand-tag { letter-spacing: .16em; font-size: .6rem; }
  .btn { padding: .62rem 1rem; font-size: .84rem; }
}

@media (max-width: 420px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle-label { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .has-js [data-reveal],
  .has-js [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }

  .footer-links a:hover { transform: none; }
  .btn-primary:hover { transform: none; }
}