:root {
  --ink-deep: #06110E;
  --ink-stand: #0A1A15;
  --ink-board: #10261F;
  --pine: #14463A;
  --mint: #4CFFD3;
  --teal: #12B892;
  --amber: #FFB13B;
  --amber-dark: #B96E0E;
  --bone: #E9F4EF;
  --mist: #9CB8AE;
  --rule: rgba(76, 255, 211, 0.16);
  --rule-soft: rgba(233, 244, 239, 0.09);
  --shell: 1280px;
  --gutter: clamp(18px, 4vw, 56px);
  --font-display: "Oswald", "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-data: "JetBrains Mono", "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --ease: 190ms cubic-bezier(0.2, 0.6, 0.3, 1);
  --nav-break: 980px;
}

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

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

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

body {
  min-height: 100vh;
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(rgba(76, 255, 211, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76, 255, 211, 0.028) 1px, transparent 1px);
  background-size: 76px 76px;
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

::selection {
  background: var(--mint);
  color: #04120E;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--mint);
  color: #04120E;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transform: translateY(-180%);
  transition: transform var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部：双层信息导航 ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(6, 17, 14, 0.96);
  box-shadow: 0 1px 0 rgba(76, 255, 211, 0.08);
}

.head-utility {
  background: var(--ink-stand);
  border-bottom: 1px solid var(--rule-soft);
}

.head-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 40px;
  padding-block: 6px;
}

.head-utility__brandline {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.07em;
  color: var(--mist);
}

.head-utility__dot {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(76, 255, 211, 0.14);
}

.head-utility__cn {
  color: var(--bone);
  font-weight: 600;
  white-space: nowrap;
}

.head-utility__sep {
  color: rgba(156, 184, 174, 0.45);
}

.head-utility__tag {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.utility-list {
  display: flex;
  align-items: center;
  gap: 20px;
  flex: none;
}

.utility-link {
  position: relative;
  display: inline-block;
  padding-block: 4px;
  font-size: 12px;
  letter-spacing: 0.09em;
  color: var(--mist);
  transition: color var(--ease);
}

.utility-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--mint);
  transition: right var(--ease);
}

.utility-link:hover { color: var(--mint); }
.utility-link:hover::after { right: 0; }

.head-main {
  background: linear-gradient(180deg, rgba(16, 38, 31, 0.92), rgba(6, 17, 14, 0.94));
  border-bottom: 1px solid var(--rule);
}

.head-main__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: var(--mint);
  color: #04120E;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 74% 100%, 0 100%);
  transition: background var(--ease), color var(--ease);
}

.brand:hover .brand__mark {
  background: var(--bone);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--bone);
}

.brand__line {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mist);
  text-transform: uppercase;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--rule);
  color: var(--bone);
  font-size: 13px;
  letter-spacing: 0.14em;
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.nav-toggle:hover {
  border-color: var(--mint);
  color: var(--mint);
  background: rgba(76, 255, 211, 0.06);
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars > span {
  display: block;
  height: 2px;
  background: var(--mint);
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle__label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.18em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  display: flex;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 12px;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: rgba(233, 244, 239, 0.78);
  transition: color var(--ease), background var(--ease);
}

.site-nav__idx {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
  transition: color var(--ease);
}

.site-nav__label {
  white-space: nowrap;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ease);
}

.site-nav__link:hover {
  color: var(--mint);
  background: rgba(76, 255, 211, 0.07);
}

.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--bone);
  background: rgba(255, 177, 59, 0.07);
}

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

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

.head-progress {
  position: relative;
  height: 2px;
  background: var(--rule);
}

.head-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--mint));
  box-shadow: 0 0 10px rgba(76, 255, 211, 0.45);
}

/* ---------- 通用布局与内容组件 ---------- */
.section {
  padding-block: clamp(56px, 8vw, 112px);
}

.sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--rule);
}

.sec-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.03em;
  color: var(--bone);
}

.sec-index {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--rule);
  background: var(--ink-board);
  color: var(--bone);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.06em;
  transition: transform var(--ease), background var(--ease), border-color var(--ease), color var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--mint);
  color: var(--mint);
  background: rgba(76, 255, 211, 0.08);
}

.btn--primary {
  background: var(--mint);
  border-color: var(--mint);
  color: #04120E;
}

.btn--primary:hover {
  background: #86FFE1;
  border-color: #86FFE1;
  color: #04120E;
}

.btn--ghost {
  background: transparent;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.crumbs a {
  color: var(--mist);
  transition: color var(--ease);
}

.crumbs a:hover { color: var(--mint); }

.crumbs__sep {
  color: rgba(156, 184, 174, 0.4);
}

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

.prose {
  max-width: 70ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: rgba(233, 244, 239, 0.9);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: 0.03em;
  color: var(--bone);
  padding-top: 0.4em;
}

.prose h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--bone);
}

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

.prose a {
  color: var(--mint);
  border-bottom: 1px solid rgba(76, 255, 211, 0.35);
  transition: border-color var(--ease);
}

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

.prose ul {
  display: grid;
  gap: 8px;
}

.prose ul > li {
  position: relative;
  padding-left: 20px;
}

.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 8px;
  height: 1px;
  background: var(--teal);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.panel {
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-board);
  border: 1px solid var(--rule);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--rule);
  background: rgba(76, 255, 211, 0.06);
  color: var(--mint);
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.data-chip--amber {
  color: var(--amber);
  border-color: rgba(255, 177, 59, 0.32);
  background: rgba(255, 177, 59, 0.08);
}

.data-chip--muted {
  color: var(--mist);
  border-color: var(--rule-soft);
  background: transparent;
}

.stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.tick-rail {
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--rule) 0 1px, transparent 1px 24px);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule);
  background:
    radial-gradient(120% 90% at 16% 0%, rgba(20, 70, 58, 0.95), rgba(6, 17, 14, 1) 62%),
    var(--ink-deep);
}

.media-frame > img,
.media-frame > svg,
.media-frame > video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(76, 255, 211, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(76, 255, 211, 0.1) 1px, transparent 1px);
  background-size: 38px 38px;
  opacity: 0.55;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  max-width: 100%;
  padding: 8px 12px;
  background: rgba(6, 17, 14, 0.82);
  border-top: 1px solid var(--rule);
  color: var(--mist);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.06em;
}

/* ---------- 页脚 ---------- */
.site-foot {
  margin-top: clamp(40px, 6vw, 80px);
  background: var(--ink-stand);
  border-top: 1px solid var(--rule);
}

.foot-tape {
  height: 10px;
  border-bottom: 1px solid var(--rule-soft);
  background-color: rgba(76, 255, 211, 0.04);
  background-image:
    repeating-linear-gradient(90deg, rgba(76, 255, 211, 0.28) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, transparent 0 129px, rgba(255, 177, 59, 0.65) 129px 132px, transparent 132px 260px);
}

.foot-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.15fr) minmax(0, 0.95fr);
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(44px, 6vw, 76px);
}

.foot-brand__name {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--bone);
}

.foot-brand__name::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 10px;
  background: var(--mint);
  vertical-align: 6px;
}

.foot-brand__desc {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.foot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.foot-tag {
  padding: 4px 9px;
  border: 1px solid var(--rule);
  background: rgba(76, 255, 211, 0.05);
  color: var(--mint);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.foot-tag--amber {
  color: var(--amber);
  border-color: rgba(255, 177, 59, 0.3);
  background: rgba(255, 177, 59, 0.08);
}

.foot-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}

.foot-col__title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal);
}

.foot-list {
  display: grid;
  gap: 10px;
}

.foot-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  color: rgba(233, 244, 239, 0.8);
  transition: color var(--ease), transform var(--ease);
}

.foot-link::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--teal);
  transition: width var(--ease), background var(--ease);
}

.foot-link:hover {
  color: var(--mint);
  transform: translateX(2px);
}

.foot-link:hover::before {
  width: 12px;
  background: var(--amber);
}

.foot-contact__list {
  display: grid;
  gap: 10px;
}

.foot-contact__item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.foot-contact__key {
  padding-top: 3px;
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.foot-contact__val {
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-all;
}

.foot-contact__val--text {
  font-family: var(--font-body);
  font-size: 13.5px;
  word-break: normal;
}

.foot-contact__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--amber-dark);
  font-size: 12px;
  line-height: 1.75;
  color: var(--mist);
}

.foot-base {
  border-top: 1px solid var(--rule-soft);
  background: rgba(6, 17, 14, 0.55);
}

.foot-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 22px;
  padding-block: 18px;
  font-size: 12px;
  color: var(--mist);
}

.foot-copy { letter-spacing: 0.04em; }

.foot-icp {
  font-family: var(--font-data);
  letter-spacing: 0.04em;
  color: rgba(156, 184, 174, 0.85);
}

.foot-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.foot-legal a {
  color: var(--mist);
  transition: color var(--ease);
}

.foot-legal a:hover { color: var(--mint); }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .site-nav__link {
    padding-inline: 9px;
    font-size: 13.5px;
  }
  .site-nav__link::after {
    left: 9px;
    right: 9px;
  }
}

@media (max-width: 980px) {
  .head-utility__inner {
    min-height: 34px;
  }
  .head-utility__brandline {
    font-size: 11px;
    gap: 8px;
  }
  .head-utility__sep,
  .head-utility__tag { display: none; }

  .head-main__inner {
    min-height: 64px;
    gap: 12px;
  }
  .brand__mark {
    width: 38px;
    height: 38px;
    font-size: 14px;
  }
  .brand__name { font-size: 20px; }

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

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 30;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    background: var(--ink-stand);
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 24px 46px rgba(0, 0, 0, 0.55);
  }

  .site-nav[data-open="true"] { display: block; }

  .site-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 14px;
  }

  .site-nav__item { display: block; }

  .site-nav__link {
    gap: 12px;
    padding: 14px 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--rule-soft);
  }

  .site-nav__link::after {
    left: 4px;
    right: 4px;
    bottom: 0;
  }

  .span-3,
  .span-4 { grid-column: span 6; }

  .span-5,
  .span-7,
  .span-8,
  .span-9 { grid-column: span 12; }

  .foot-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }
}

@media (max-width: 620px) {
  .head-utility__inner {
    gap: 10px;
  }
  .head-utility__cn { font-size: 11px; }
  .utility-list { gap: 13px; }
  .utility-link {
    font-size: 11px;
    letter-spacing: 0.05em;
  }

  .grid-12 > .span-3,
  .grid-12 > .span-4,
  .grid-12 > .span-5,
  .grid-12 > .span-6,
  .grid-12 > .span-7,
  .grid-12 > .span-8,
  .grid-12 > .span-9,
  .grid-12 > .span-12 { grid-column: span 12; }

  .foot-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .foot-base__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 400px) {
  .brand__line { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .btn:hover,
  .btn:focus-visible,
  .foot-link:hover {
    transform: none;
  }
}