/* ==========================================================
   KAIYUN看台 / shared site.css
   夜赛墨绿底 · 蓝图网格 · 88px 侧边轨道 · 青柠主锚点
   ========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body { margin: 0; }

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

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

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

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

/* ---------- 2. tokens ---------- */
:root {
  --ink: #0B1714;
  --ink-2: #14191A;
  --board: #1C2724;
  --grid: #33423E;
  --grid-soft: rgba(51, 66, 62, .55);
  --lime: #C8F542;
  --amber: #E9A63C;
  --paper: #F1F3EC;
  --fog: #9BA8A2;
  --fog-dim: #6E7C77;
  --cyan: #5FD3C4;
  --alert: #E2604A;

  --rail-w: 88px;
  --pad: clamp(18px, 4vw, 40px);

  --mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --display: "Helvetica Neue", "Arial Narrow", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;

  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. base ---------- */
body {
  padding-left: var(--rail-w);
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(51, 66, 62, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(51, 66, 62, .30) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.01em;
}
h1 { font-size: clamp(28px, 4vw, 44px); }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: clamp(18px, 2.2vw, 24px); }
h4 { font-size: 18px; }

a { color: inherit; }

::selection { background: var(--lime); color: var(--ink); }

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

#main-content { display: block; min-height: 60vh; }

/* ---------- 4. skip link ---------- */
.skip-link {
  position: fixed;
  left: 8px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  transition: top .15s var(--ease);
}
.skip-link:focus { top: 8px; }

/* ---------- 5. header / rail ---------- */
.site-header { position: static; }

.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 90;
  display: flex;
  flex-direction: column;
  padding: 12px 0 14px;
  background: var(--ink-2);
  border-right: 1px solid var(--grid);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
}

.rail-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  padding: 2px 4px 12px;
  border-bottom: 1px solid var(--grid);
  color: var(--paper);
  text-decoration: none;
}
.rail-brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  transition: background-color .18s var(--ease);
}
.rail-brand__text {
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.35;
  letter-spacing: .16em;
  text-align: center;
  color: var(--fog);
}
.rail-brand:hover .rail-brand__mark { background: var(--paper); }
.rail-brand:hover .rail-brand__text { color: var(--lime); }

/* ---------- 6. nav ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--grid);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.nav-toggle__label { line-height: 1; }

.site-nav {
  flex: 1 1 auto;
  min-height: 0;
  padding: 12px 0 0;
}
.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__item { margin: 0; }
.site-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 9px 5px;
  color: var(--fog);
  font-size: 10px;
  line-height: 1.25;
  letter-spacing: .01em;
  text-align: center;
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease);
}
.site-nav__idx {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  color: var(--fog-dim);
  transition: color .18s var(--ease);
}
.site-nav__label { display: block; }
.site-nav__link:hover { color: var(--paper); background: rgba(200, 245, 66, .06); }
.site-nav__link:hover .site-nav__idx { color: var(--lime); }
.site-nav__link[aria-current="page"] {
  color: var(--lime);
  background: rgba(200, 245, 66, .08);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--lime); }
.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--lime);
}

.rail-cta {
  display: block;
  margin: 12px 8px 0;
  padding: 9px 4px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .06em;
  text-align: center;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background-color .18s var(--ease);
}
.rail-cta:hover { background: var(--paper); }

.rail-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 14px 0 0;
  color: var(--fog-dim);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .12em;
}
.rail-meta__tick { display: block; width: 14px; height: 1px; background: var(--grid); }
.rail-meta__txt { line-height: 1; }

/* ---------- 7. footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-2);
  border-top: 1px solid var(--grid);
  color: var(--fog);
  font-size: 14px;
  line-height: 1.8;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--lime) 0 2px, transparent 2px 26px);
  opacity: .35;
  pointer-events: none;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(42px, 6vw, 72px) var(--pad) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: 32px 48px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--grid);
}

.footer-brand { min-width: 0; }
.footer-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  text-decoration: none;
}
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
}
.footer-brand__name {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .14em;
}
.footer-brand__link:hover .footer-brand__mark { background: var(--paper); }
.footer-brand__desc {
  margin-top: 14px;
  max-width: 34ch;
  color: var(--fog);
  font-size: 14px;
}

.footer-col { min-width: 0; }
.footer-col--contact { min-width: 0; }
.footer-col__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
}
.footer-col__idx {
  font-size: 10px;
  letter-spacing: .04em;
  color: var(--lime);
}

.footer-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 12px;
}
.footer-list__k {
  min-width: 66px;
  color: var(--fog-dim);
  font-size: 12px;
  letter-spacing: .08em;
}
.footer-list__v {
  color: var(--paper);
  font-size: 14px;
  word-break: break-word;
}

.footer-note {
  margin-top: 16px;
  padding: 10px 12px;
  border-left: 2px solid var(--amber);
  background: rgba(233, 166, 60, .06);
  color: var(--fog);
  font-size: 12.5px;
  line-height: 1.7;
}

.footer-mid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px 48px;
  padding: 30px 0;
  border-bottom: 1px solid var(--grid);
}
.footer-nav { min-width: 0; }
.footer-filing { min-width: 0; }

.footer-list--links {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 20px;
}
.footer-list--links li { display: block; }
.footer-list--links a {
  display: inline-block;
  color: var(--fog);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer-list--links a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.footer-filing__line {
  color: var(--fog);
  font-size: 13px;
  letter-spacing: .02em;
}
.footer-filing__line + .footer-filing__line { margin-top: 8px; }
.footer-filing__line .mono { color: var(--paper); }

.footer-base {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px 32px;
  padding-top: 24px;
  color: var(--fog-dim);
  font-size: 12.5px;
}
.footer-base__serve { max-width: 62ch; color: var(--fog); }
.footer-base__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.footer-base__legal a { color: var(--fog); text-decoration: none; }
.footer-base__legal a:hover { color: var(--lime); }
.footer-base__copy {
  grid-column: 1 / -1;
  padding-top: 14px;
  border-top: 1px solid var(--grid);
  color: var(--fog-dim);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .08em;
}

/* ---------- 8. layout utilities ---------- */
.page-wrap {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--pad);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--grid);
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--fog);
}

.display {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.015em;
  transform: skewX(-2.5deg);
  transform-origin: left center;
  color: var(--paper);
}

/* ---------- 9. components ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: transparent;
  border: 1px solid var(--grid);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .06em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.btn:hover { border-color: var(--lime); color: var(--lime); }
.btn--primary {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}
.btn--primary:hover { background: var(--paper); border-color: var(--paper); color: var(--ink); }
.btn--ghost { background: rgba(28, 39, 36, .6); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--grid);
  background: transparent;
  color: var(--fog);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .06em;
  white-space: nowrap;
}
.tag--lime { border-color: var(--lime); color: var(--lime); background: rgba(200, 245, 66, .08); }
.tag--amber { border-color: var(--amber); color: var(--amber); background: rgba(233, 166, 60, .08); }
.tag--cyan { border-color: var(--cyan); color: var(--cyan); background: rgba(95, 211, 196, .08); }
.tag--alert { border-color: var(--alert); color: var(--alert); background: rgba(226, 96, 74, .08); }

.card {
  position: relative;
  padding: 20px;
  background: var(--board);
  border: 1px solid var(--grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}
.card:hover { border-color: var(--lime); background: #1F2C28; }

.note {
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  color: var(--fog);
  font-size: 13px;
  line-height: 1.75;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  color: var(--fog);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.crumbs a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.crumbs a:hover { color: var(--lime); border-bottom-color: var(--lime); }
.crumbs__sep { color: var(--grid); }

/* ---------- 10. figure / image containers ---------- */
.figure {
  position: relative;
  margin: 0;
  background: var(--board);
  border: 1px solid var(--grid);
  overflow: hidden;
}
.figure__img {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(150deg, #1C2724 0%, #0B1714 72%);
}
.figure__img > img,
.figure__img > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.88) contrast(1.04);
}
.figure__img::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .38;
  background-image:
    repeating-linear-gradient(0deg, rgba(11, 23, 20, .30) 0 1px, transparent 1px 4px),
    linear-gradient(to right, rgba(51, 66, 62, .25) 1px, transparent 1px);
  background-size: auto, 48px 100%;
}
.figure__cap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 12px;
  padding: 10px 12px;
  border-top: 1px solid var(--grid);
  color: var(--fog);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
}
.figure--wide .figure__img { aspect-ratio: 21 / 9; }
.figure--tall .figure__img { aspect-ratio: 4 / 5; }
.figure--square .figure__img { aspect-ratio: 1 / 1; }

/* ---------- 11. tabset / segmented ---------- */
.tabset { display: block; }
.tabset__list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--grid);
}
.tabset__tab {
  appearance: none;
  padding: 10px 16px;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--fog);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .05em;
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.tabset__tab:hover { color: var(--paper); background: rgba(200, 245, 66, .06); }
.tabset__tab[aria-selected="true"] {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.tabset__tab:focus-visible { outline: 2px solid var(--lime); outline-offset: -2px; }
.tabset__panel { padding-top: 22px; }
.tabset__panel[hidden] { display: none; }

@media (prefers-reduced-motion: no-preference) {
  .tabset__panel { animation: tab-in .22s var(--ease) both; }
}
@keyframes tab-in {
  from { opacity: 0; transform: translateX(14px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 12. scroll progress + back to top ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 2px;
  background: var(--lime);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 110;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: var(--board);
  border: 1px solid var(--grid);
  color: var(--lime);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s var(--ease), visibility .2s var(--ease), border-color .2s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; }
.to-top:hover { border-color: var(--lime); background: rgba(200, 245, 66, .1); }

/* ---------- 13. responsive ---------- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-mid { grid-template-columns: minmax(0, 1fr); }
  .footer-base { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .footer-top { gap: 28px; }
  .footer-mid { gap: 28px; }
}

@media (max-width: 768px) {
  body {
    padding-left: 0;
    font-size: 16px;
    line-height: 1.8;
    background-size: 56px 56px;
  }

  .site-header { position: sticky; top: 0; z-index: 95; }

  .rail {
    position: relative;
    inset: auto;
    width: 100%;
    height: 56px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    border-right: 0;
    border-bottom: 1px solid var(--grid);
    overflow: visible;
  }

  .rail-brand {
    flex-direction: row;
    align-items: center;
    gap: 9px;
    padding: 0;
    border-bottom: 0;
  }
  .rail-brand__mark { width: 30px; height: 30px; font-size: 15px; }
  .rail-brand__text { font-size: 9px; letter-spacing: .12em; text-align: left; }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex: none;
    padding: 0;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    background: var(--ink-2);
    border-bottom: 1px solid var(--grid);
  }
  .site-header[data-open] .site-nav { display: block; }

  .site-nav__list { gap: 0; padding: 6px 0 12px; }
  .site-nav__link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: 13px 18px;
    font-size: 15px;
    letter-spacing: .02em;
    text-align: left;
    border-bottom: 1px solid rgba(51, 66, 62, .5);
  }
  .site-nav__idx { width: 18px; font-size: 10px; }
  .site-nav__link[aria-current="page"]::before { top: 0; bottom: 0; }

  .site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(5.25px) rotate(45deg); }
  .site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
  .site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5.25px) rotate(-45deg); }

  .rail-cta { display: none; }
  .rail-meta { display: none; }

  .footer-inner { padding-top: 40px; }
  .footer-base__legal { font-size: 11.5px; }
  .to-top { right: 14px; bottom: 14px; width: 40px; height: 40px; }
}

@media (max-width: 520px) {
  .footer-list li { flex-direction: column; gap: 0; }
  .footer-list__k { min-width: 0; }
  .footer-list--links { grid-template-columns: minmax(0, 1fr); }
  .footer-col__title { margin-bottom: 12px; }
  .figure__img { aspect-ratio: 4 / 3; }
}

/* ---------- 14. reduced motion ---------- */
@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;
  }
  .display { transform: none; }
}