/* =========================================================
   云开平台 · 共享样式表  /assets/site.css
   基调：深空蓝夜场大屏 + 蓝图网格 + 切角面板
   ========================================================= */

/* ---------- 0. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

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

button { background: none; border: 0; cursor: pointer; }

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

table { border-collapse: collapse; width: 100%; }

/* ---------- 1. Tokens ---------- */
:root {
  --cv-deep: #06172E;
  --cv-night: #0C2644;
  --cv-grid: #1D3C61;
  --cv-panel: #123152;
  --cv-cyan: #2FD4E8;
  --cv-violet: #8A5CFF;
  --cv-lime: #B7F547;
  --cv-orange: #FF7A59;
  --cv-ink: #EDF4FF;
  --cv-muted: #9FB4D0;
  --cv-dim: #6C88AC;

  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --rail-w: 236px;
  --topbar-h: 64px;
  --pad-x: clamp(1rem, 3.2vw, 3rem);
  --ease: cubic-bezier(.22, .7, .24, 1);
  --cut: 18px;
  --cut-poly: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

/* ---------- 2. Base ---------- */
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 20px); }

body {
  min-height: 100vh;
  padding: var(--topbar-h) 0 0;
  color: var(--cv-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
  background-color: var(--cv-deep);
  background-image:
    radial-gradient(1100px 620px at 88% -8%, rgba(138, 92, 255, .20), transparent 62%),
    radial-gradient(880px 520px at 4% 4%, rgba(47, 212, 232, .14), transparent 64%),
    linear-gradient(to right, rgba(29, 60, 97, .40) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(29, 60, 97, .40) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
}

body.is-nav-open { overflow: hidden; }

::selection { background: var(--cv-cyan); color: #04121F; }

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.01em;
}

h1 { font-size: clamp(2.3rem, 6vw, 4.6rem); }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.5rem); }
h3 { font-size: clamp(1.08rem, 1.8vw, 1.35rem); letter-spacing: 0; }
h4 { font-size: 1rem; letter-spacing: 0; }

main { display: block; }

/* ---------- 3. Header : 框架导航轨 ---------- */
.site-header { position: relative; z-index: 80; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  --cut: 8px;
  padding: .6rem 1rem;
  font-size: .85rem;
  font-weight: 700;
  color: #04121F;
  background: var(--cv-cyan);
  clip-path: var(--cut-poly);
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}

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

.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(330px, 88vw);
  z-index: 90;
  display: flex;
  flex-direction: column;
  padding: 1.1rem 0 1.25rem;
  background: linear-gradient(180deg, #0A2140 0%, #06172E 62%, #06172E 100%);
  border-right: 1px solid var(--cv-grid);
  transform: translateX(-104%);
  transition: transform .32s var(--ease);
}

.rail[data-open="true"] { transform: translateX(0); }

.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 10px;
  pointer-events: none;
  opacity: .5;
  background-image: repeating-linear-gradient(to bottom, var(--cv-grid) 0 1px, transparent 1px 26px);
}

.rail__top { padding: 0 1.25rem 1.2rem; }

.brand { display: flex; align-items: center; gap: .7rem; }

.brand__mark {
  width: 40px;
  height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #04121F;
  background: linear-gradient(140deg, var(--cv-cyan), var(--cv-lime));
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .18em;
  color: var(--cv-dim);
}

.rail__nav {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 0 .75rem;
}

.rail__label {
  margin-bottom: .6rem;
  padding: 0 .5rem .7rem;
  border-bottom: 1px solid var(--cv-grid);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .24em;
  color: var(--cv-dim);
}

.nav-list { display: flex; flex-direction: column; gap: 2px; }

.nav-link {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  align-items: center;
  padding: .62rem .5rem;
  border-left: 2px solid transparent;
  color: var(--cv-muted);
  font-size: .94rem;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.nav-link__idx {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--cv-dim);
}

.nav-link:hover { color: var(--cv-ink); background: rgba(47, 212, 232, .08); }

.nav-link[aria-current="page"] {
  color: var(--cv-ink);
  font-weight: 600;
  border-left-color: var(--cv-cyan);
  background: linear-gradient(90deg, rgba(47, 212, 232, .22), rgba(47, 212, 232, 0));
}

.nav-link[aria-current="page"] .nav-link__idx { color: var(--cv-lime); }

.rail__bottom {
  margin-top: .8rem;
  padding: 1rem 1.25rem 0;
  border-top: 1px solid var(--cv-grid);
}

.version-chip {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  font-family: var(--font-mono);
  letter-spacing: .1em;
}

.version-chip__key {
  font-size: .64rem;
  text-transform: uppercase;
  color: var(--cv-dim);
}

.version-chip__val {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cv-lime);
}

.rail__coords {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .14em;
  color: var(--cv-dim);
}

.rail-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(3, 10, 20, .68);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}

.rail[data-open="true"] + .rail-scrim { opacity: 1; pointer-events: auto; }

/* ---------- 4. Topbar ---------- */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  z-index: 70;
  display: flex;
  align-items: center;
  gap: .9rem;
  padding: 0 var(--pad-x);
  background: rgba(6, 23, 46, .9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cv-grid);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  flex: none;
  padding: .5rem .7rem;
  color: var(--cv-ink);
  box-shadow: inset 0 0 0 1px var(--cv-grid);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cv-cyan);
  transition: background-color .2s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--cv-cyan);
  transition: transform .22s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.topbar__line {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--cv-muted);
}

.topbar__brandname { font-weight: 700; color: var(--cv-ink); }
.topbar__sep { color: var(--cv-grid); margin: 0 .3rem; }

.topbar__cta { flex: none; }
.topbar__cta { display: none; }

.topbar__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--cv-cyan), var(--cv-lime));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 5. Footer ---------- */
.site-footer {
  margin-top: clamp(3rem, 7vw, 6rem);
  padding: clamp(2.2rem, 5vw, 3.6rem) var(--pad-x) 1.6rem;
  border-top: 1px solid var(--cv-grid);
  background:
    radial-gradient(700px 360px at 88% 0%, rgba(138, 92, 255, .16), transparent 62%),
    linear-gradient(180deg, rgba(12, 38, 68, .74), rgba(6, 23, 46, .98));
}

.footer__inner {
  width: min(1240px, 100%);
  margin-inline: auto;
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  grid-template-columns: 1fr;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.footer__tag {
  margin-top: .3rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .2em;
  color: var(--cv-cyan);
}

.footer__stat {
  margin-top: .9rem;
  max-width: 34ch;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--cv-muted);
}

.footer__cols {
  display: grid;
  gap: 1.6rem;
  grid-template-columns: 1fr;
}

.footer__col-title {
  margin-bottom: .8rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--cv-grid);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cv-dim);
}

.footer__links { display: flex; flex-direction: column; gap: .5rem; }

.footer__link {
  display: inline-block;
  font-size: .92rem;
  color: var(--cv-muted);
  transition: color .18s var(--ease), transform .18s var(--ease);
}

.footer__link:hover { color: var(--cv-cyan); transform: translateX(3px); }

.footer__meta {
  width: min(1240px, 100%);
  margin: clamp(1.8rem, 4vw, 2.6rem) auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--cv-grid);
  display: grid;
  gap: .7rem;
}

.footer__contact {
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1.9;
  letter-spacing: .04em;
  color: var(--cv-muted);
}

.footer__note { font-size: .84rem; color: var(--cv-dim); }

.footer__legal {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--cv-dim);
}

.to-top {
  --cut: 8px;
  justify-self: start;
  margin-top: .4rem;
  padding: .55rem .95rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: var(--cv-ink);
  background: rgba(18, 49, 82, .72);
  box-shadow: inset 0 0 0 1px var(--cv-grid);
  clip-path: var(--cut-poly);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s var(--ease), box-shadow .2s, color .2s;
}

.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--cv-lime); box-shadow: inset 0 0 0 1px var(--cv-lime); }

/* ---------- 6. 通用按钮 / 标签 / 状态 ---------- */
.btn {
  --cut: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.25rem;
  font-family: var(--font-body);
  font-size: .92rem;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1;
  white-space: nowrap;
  clip-path: var(--cut-poly);
  transition: background-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
}

.btn--primary { background: var(--cv-cyan); color: #04121F; }
.btn--primary:hover { background: var(--cv-lime); }

.btn--violet { background: var(--cv-violet); color: #F4F0FF; }
.btn--violet:hover { background: #9E78FF; }

.btn--ghost {
  color: var(--cv-ink);
  background: rgba(18, 49, 82, .55);
  box-shadow: inset 0 0 0 1px var(--cv-grid);
}

.btn--ghost:hover { color: var(--cv-cyan); box-shadow: inset 0 0 0 1px var(--cv-cyan); }

.btn[aria-pressed="true"],
.btn.is-on { background: var(--cv-lime); color: #04121F; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .25rem .55rem;
  border: 1px solid var(--cv-grid);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--cv-muted);
}

.tag--cyan { border-color: rgba(47, 212, 232, .5); color: var(--cv-cyan); }
.tag--violet { border-color: rgba(138, 92, 255, .55); color: #BFA8FF; }
.tag--lime { border-color: rgba(183, 245, 71, .5); color: var(--cv-lime); }

.status-bar {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .6rem .95rem;
  border-left: 3px solid var(--cv-lime);
  background: rgba(183, 245, 71, .10);
  font-size: .9rem;
  color: var(--cv-ink);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}

.status-bar.is-on { opacity: 1; transform: none; }

.is-hidden { display: none !important; }

/* ---------- 7. 布局容器与网格 ---------- */
.wrap { width: min(1240px, 100% - var(--pad-x) * 2); margin-inline: auto; }

.section { padding-block: clamp(2.4rem, 5.5vw, 4.8rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem 1.25rem;
  margin-bottom: clamp(1.4rem, 3vw, 2.4rem);
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--cv-grid);
}

.section-num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--cv-cyan);
}

.section-title { font-family: var(--font-display); font-size: clamp(1.55rem, 3.2vw, 2.4rem); }

.section-sub { font-size: .9rem; color: var(--cv-muted); }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding-block: 1.2rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--cv-dim);
}

.crumbs a:hover { color: var(--cv-cyan); }
.crumbs__sep { color: var(--cv-grid); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.6rem);
}

.grid-12 > * { grid-column: span 12; }

/* ---------- 8. 切角面板 / 图片容器 ---------- */
.panel {
  position: relative;
  padding: clamp(1.05rem, 2.4vw, 1.8rem);
  border: 1px solid rgba(29, 60, 97, .95);
  background: linear-gradient(160deg, rgba(18, 49, 82, .95), rgba(12, 38, 68, .9));
  clip-path: var(--cut-poly);
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background: var(--cv-cyan);
}

.panel--violet::before { background: var(--cv-violet); }
.panel--lime::before { background: var(--cv-lime); }

.panel--plain { background: transparent; border-color: var(--cv-grid); }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--cv-grid);
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(138, 92, 255, .35), transparent 60%),
    linear-gradient(150deg, #0C2644, #06172E);
  clip-path: var(--cut-poly);
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(47, 212, 232, .13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 212, 232, .13) 1px, transparent 1px);
  background-size: 48px 48px;
}

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

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: .4rem .8rem;
  border-top: 1px solid var(--cv-grid);
  border-right: 1px solid var(--cv-grid);
  background: rgba(6, 23, 46, .8);
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--cv-ink);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 9. 章节目录 / 筛选 ---------- */
.toc {
  position: sticky;
  top: calc(var(--topbar-h) + 1.4rem);
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .86rem;
}

.toc__title {
  margin-bottom: .4rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--cv-grid);
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .22em;
  color: var(--cv-dim);
}

.toc a {
  padding: .3rem .6rem;
  border-left: 2px solid transparent;
  color: var(--cv-muted);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.toc a:hover { color: var(--cv-ink); }

.toc a.is-current {
  color: var(--cv-cyan);
  border-left-color: var(--cv-cyan);
  background: rgba(47, 212, 232, .08);
}

.filter-bar { display: flex; flex-wrap: wrap; gap: .5rem; }

.filter-chip {
  padding: .42rem .8rem;
  border: 1px solid var(--cv-grid);
  background: rgba(12, 38, 68, .6);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--cv-muted);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.filter-chip:hover { color: var(--cv-ink); border-color: var(--cv-cyan); }

.filter-chip.is-active,
.filter-chip[aria-pressed="true"] {
  background: var(--cv-cyan);
  border-color: var(--cv-cyan);
  color: #04121F;
}

/* ---------- 10. 入场动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 11. 响应式 ---------- */
@media (min-width: 600px) {
  .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .topbar__cta { display: inline-flex; }
}

@media (min-width: 760px) {
  .footer__inner { grid-template-columns: minmax(250px, 1.15fr) 2fr; }
}

@media (min-width: 900px) {
  .col-span-3 { grid-column: span 3; }
  .col-span-4 { grid-column: span 4; }
  .col-span-5 { grid-column: span 5; }
  .col-span-6 { grid-column: span 6; }
  .col-span-7 { grid-column: span 7; }
  .col-span-8 { grid-column: span 8; }
  .col-span-9 { grid-column: span 9; }
  .col-span-12 { grid-column: span 12; }
}

@media (min-width: 1024px) {
  body { padding: var(--topbar-h) 0 0 var(--rail-w); }

  .rail {
    width: var(--rail-w);
    transform: none;
  }

  .rail-scrim { display: none; }

  .topbar { left: var(--rail-w); }

  .nav-toggle { display: none; }
}

@media (max-width: 599px) {
  .topbar__desc,
  .topbar__sep { display: none; }
  .topbar__line { font-size: .8rem; letter-spacing: .08em; }
}

/* ---------- 12. 无障碍 / 减弱动效 ---------- */
@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;
  }

  .reveal { opacity: 1; transform: none; }
  .to-top { transform: none; }
}