/* ==========================================================================
   机器人APP下载 内页骨架：下载面板风 · 暗色 Hero + 平台切换标签页（纯 CSS）+ 数据格
   ========================================================================== */

:root {
  --jb-bg: #070b12;
  --jb-panel: #0d1420;
  --jb-line: rgba(59, 130, 246, .2);
  --jb-blue: #3b82f6;
  --jb-sky: #7dd3fc;
  --jb-text: #dbe6f2;
  --jb-muted: #8394a8;
}

body.jb-page {
  background: var(--jb-bg);
  color: var(--jb-text);
}

.jb-page .site-header { background: rgba(7, 11, 18, .9); border-bottom-color: rgba(59, 130, 246, .18); }
.jb-page .brand-text { color: #fff; }
.jb-page .brand-mark { background: linear-gradient(140deg, #7dd3fc, #2563eb); color: #041022; box-shadow: 0 6px 18px rgba(37, 99, 235, .35); }
.jb-page .brand-text em { color: var(--jb-sky); }
.jb-page .site-nav a { color: #9aabbd; }
.jb-page .site-nav a:hover { color: #fff; }
.jb-page .site-nav a.is-active { color: var(--jb-sky); }
.jb-page .site-nav a::after { background: var(--jb-sky); }
.jb-page .btn-login { background: linear-gradient(135deg, #38bdf8, #2563eb); box-shadow: 0 8px 22px rgba(37, 99, 235, .35); }
.jb-page .nav-toggle { background: transparent; border-color: rgba(59, 130, 246, .35); }
.jb-page .nav-toggle span { background: var(--jb-sky); }

@media (max-width: 960px) {
  .jb-page .site-nav { background: #0d1420; border-bottom-color: rgba(59, 130, 246, .25); }
  .jb-page .site-nav a { color: #9aabbd; }
}

/* ---------------- Hero ---------------- */
.jb-hero {
  position: relative;
  overflow: hidden;
  padding: 74px 0 92px;
  background:
    radial-gradient(720px 440px at 80% 12%, rgba(37, 99, 235, .28), transparent 66%),
    radial-gradient(520px 380px at 2% 92%, rgba(56, 189, 248, .1), transparent 70%),
    var(--jb-bg);
}

.jb-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, .07) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse at 60% 30%, #000, transparent 74%);
  -webkit-mask-image: radial-gradient(ellipse at 60% 30%, #000, transparent 74%);
  pointer-events: none;
}

.jb-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 50px;
  align-items: center;
}

.jb-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--jb-line);
  background: rgba(59, 130, 246, .08);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--jb-sky);
}

.jb-tag i {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 4px rgba(34, 197, 94, .16);
  animation: jbPulse 2s infinite;
}

@keyframes jbPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}

.jb-hero h1 {
  margin: 22px 0 16px;
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -.5px;
  color: #fff;
}

.jb-hero h1 span { color: var(--jb-sky); }

.jb-hero .lead {
  font-size: 16px;
  line-height: 1.95;
  color: var(--jb-muted);
  max-width: 550px;
}

.jb-hero .lead strong { color: var(--jb-text); }

.jb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 32px 0 22px;
}

.jb-actions .btn-primary {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #041022;
  box-shadow: 0 16px 36px rgba(37, 99, 235, .3);
}

.jb-actions .btn-room {
  border-color: rgba(125, 211, 252, .35);
  background: rgba(59, 130, 246, .07);
  color: var(--jb-text);
  font-family: var(--mono);
  font-size: 14px;
}

.jb-actions .btn-room b { color: var(--jb-sky); letter-spacing: 2px; }

.jb-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: #6c7d92;
}

.jb-meta span {
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid rgba(59, 130, 246, .16);
  background: rgba(59, 130, 246, .05);
}

.jb-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.jb-visual img {
  width: min(100%, 460px);
  filter: drop-shadow(0 0 60px rgba(37, 99, 235, .32));
}

.jb-visual .panel-float {
  position: absolute;
  left: -6px;
  bottom: 40px;
  width: 224px;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--jb-line);
  background: rgba(13, 20, 32, .92);
  backdrop-filter: blur(8px);
  box-shadow: 0 22px 44px rgba(0, 0, 0, .5);
}

.jb-visual .panel-float .k { font-family: var(--mono); font-size: 11px; color: #6c7d92; }
.jb-visual .panel-float .v { font-size: 17px; font-weight: 800; color: #fff; margin-top: 4px; }
.jb-visual .panel-float .bar {
  margin-top: 12px;
  height: 6px;
  border-radius: 3px;
  background: rgba(59, 130, 246, .2);
  overflow: hidden;
}

.jb-visual .panel-float .bar i {
  display: block;
  width: 80%;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, #38bdf8, #2563eb);
}

/* ---------------- 平台切换（纯 CSS 标签页） ---------------- */
.plat-tabs { position: relative; }

.plat-tabs > input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--jb-line);
  border-radius: 14px;
  background: rgba(13, 20, 32, .8);
  margin-bottom: 22px;
}

.tab-bar label {
  flex: 1;
  min-width: 140px;
  padding: 13px 20px;
  border-radius: 10px;
  text-align: center;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--jb-muted);
  cursor: pointer;
  transition: background .2s, color .2s;
}

.tab-bar label span {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  color: #5d6f84;
  margin-top: 2px;
}

.tab-bar label:hover { color: var(--jb-text); background: rgba(59, 130, 246, .08); }

.tab-panels { position: relative; }

.tab-panel { display: none; }

#plat-android:checked ~ .tab-bar label[for="plat-android"],
#plat-ios:checked ~ .tab-bar label[for="plat-ios"],
#plat-pc:checked ~ .tab-bar label[for="plat-pc"] {
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #041022;
}

#plat-android:checked ~ .tab-bar label[for="plat-android"] span,
#plat-ios:checked ~ .tab-bar label[for="plat-ios"] span,
#plat-pc:checked ~ .tab-bar label[for="plat-pc"] span { color: rgba(4, 16, 34, .7); }

#plat-android:checked ~ .tab-panels .tab-panel[data-os="android"],
#plat-ios:checked ~ .tab-panels .tab-panel[data-os="ios"],
#plat-pc:checked ~ .tab-panels .tab-panel[data-os="pc"] { display: block; }

.plat-tabs > input:focus-visible ~ .tab-bar label { outline: 2px solid var(--jb-sky); outline-offset: 2px; }

.panel-inner {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 26px;
  padding: 34px;
  border: 1px solid var(--jb-line);
  border-radius: 16px;
  background: linear-gradient(160deg, #0d1420, #080d16);
}

.panel-inner h3 { font-size: 19px; font-weight: 900; color: #fff; margin-bottom: 8px; }
.panel-inner .req {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--jb-sky);
  margin-bottom: 18px;
}

.panel-steps { display: grid; gap: 14px; counter-reset: ps; }

.panel-steps li {
  counter-increment: ps;
  position: relative;
  padding-left: 40px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #a9bbc9;
}

.panel-steps li::before {
  content: counter(ps);
  position: absolute;
  left: 0; top: 2px;
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: 8px;
  border: 1px solid var(--jb-line);
  background: rgba(59, 130, 246, .1);
  color: var(--jb-sky);
  font-family: var(--mono);
  font-size: 12px;
}

.panel-steps li strong { color: #fff; }

.panel-aside {
  padding: 22px;
  border-radius: 12px;
  border: 1px dashed rgba(59, 130, 246, .28);
  background: rgba(59, 130, 246, .05);
}

.panel-aside h4 {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--jb-sky);
  margin-bottom: 12px;
}

.panel-aside dl { display: grid; gap: 10px; }
.panel-aside dt { font-size: 12px; color: #6c7d92; }
.panel-aside dd { margin: 2px 0 0; font-size: 14px; font-weight: 700; color: #fff; }
.panel-aside .note { margin-top: 16px; font-size: 12.5px; line-height: 1.75; color: var(--jb-muted); }

/* ---------------- 数据格 ---------------- */
.jb-data {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.data-tile {
  padding: 24px;
  border: 1px solid var(--jb-line);
  border-radius: 14px;
  background: rgba(13, 20, 32, .7);
}

.data-tile .k {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: #5d6f84;
  margin-bottom: 8px;
}

.data-tile .v {
  display: block;
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  font-family: var(--mono);
}

.data-tile .v small { font-size: 12px; font-weight: 400; color: var(--jb-muted); margin-left: 4px; }

/* ---------------- 段落 ---------------- */
.jb-section { padding: 84px 0; }

.jb-head { max-width: 700px; margin-bottom: 38px; }

.jb-head .k {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--jb-sky);
}

.jb-head h2 {
  margin: 14px 0 10px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 900;
  color: #fff;
  line-height: 1.3;
}

.jb-head p { font-size: 15.5px; color: var(--jb-muted); }

/* 更新日志 */
.release-list { display: grid; gap: 12px; }

.release {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 22px;
  align-items: start;
  padding: 22px 24px;
  border: 1px solid var(--jb-line);
  border-radius: 12px;
  background: rgba(13, 20, 32, .6);
  transition: border-color .2s, transform .2s;
}

.release:hover { border-color: rgba(59, 130, 246, .5); transform: translateX(4px); }

.release .ver { font-family: var(--mono); font-size: 15px; font-weight: 700; color: var(--jb-sky); }
.release .date { font-family: var(--mono); font-size: 12px; color: #5d6f84; margin-top: 4px; }
.release h3 { font-size: 15.5px; font-weight: 800; color: #fff; margin-bottom: 6px; }
.release p { font-size: 13.5px; line-height: 1.8; color: var(--jb-muted); }

.release .flag {
  padding: 4px 10px;
  border-radius: 5px;
  border: 1px solid rgba(34, 197, 94, .4);
  color: #4ade80;
  font-family: var(--mono);
  font-size: 11px;
  white-space: nowrap;
}

.release .flag.old { border-color: rgba(148, 163, 184, .3); color: #94a3b8; }

/* FAQ */
.jb-faq { display: grid; gap: 10px; }

.jb-faq .acc-item {
  border: 1px solid var(--jb-line);
  border-radius: 12px;
  background: rgba(13, 20, 32, .6);
  overflow: hidden;
  transition: border-color .2s;
}

.jb-faq .acc-item.is-open { border-color: rgba(59, 130, 246, .5); }

.jb-faq .acc-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  border: 0;
  background: none;
  text-align: left;
  font-size: 15px;
  font-weight: 700;
  color: var(--jb-text);
}

.jb-faq .acc-trigger .sign {
  margin-left: auto;
  flex: none;
  font-family: var(--mono);
  color: var(--jb-sky);
  transition: transform .25s;
}

.jb-faq .acc-item.is-open .acc-trigger .sign { transform: rotate(45deg); }

.jb-faq .acc-panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .3s; }
.jb-faq .acc-item.is-open .acc-panel { grid-template-rows: 1fr; }
.jb-faq .acc-panel > div { overflow: hidden; }
.jb-faq .acc-panel p { padding: 0 22px 20px; font-size: 14px; line-height: 1.9; color: var(--jb-muted); }
.jb-faq .acc-panel a { color: var(--jb-sky); }

/* 相关 */
.jb-related {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 20px;
}

.jb-related a {
  padding: 24px;
  border: 1px solid var(--jb-line);
  border-radius: 12px;
  background: rgba(13, 20, 32, .6);
  transition: border-color .2s, transform .2s;
}

.jb-related a:hover { border-color: rgba(59, 130, 246, .5); transform: translateY(-3px); }
.jb-related strong { display: block; font-size: 15px; color: #fff; margin-bottom: 5px; }
.jb-related span { font-size: 12.5px; color: var(--jb-muted); }

/* CTA */
.jb-cta { padding: 0 0 90px; }

.jb-cta-box {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  align-items: center;
  gap: 34px;
  padding: 48px;
  border-radius: 18px;
  border: 1px solid rgba(59, 130, 246, .3);
  background:
    radial-gradient(480px 240px at 88% 12%, rgba(56, 189, 248, .16), transparent 70%),
    linear-gradient(135deg, #0e1725, #070b12);
}

.jb-cta-box h2 { font-size: clamp(23px, 2.8vw, 32px); font-weight: 900; color: #fff; margin-bottom: 10px; }
.jb-cta-box p { font-size: 15px; color: var(--jb-muted); }
.jb-cta-box .row { display: flex; flex-wrap: wrap; gap: 12px; }

.jb-cta-box .tg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 24px;
  border-radius: 12px;
  border: 1px solid rgba(125, 211, 252, .3);
  color: var(--jb-text);
  font-family: var(--mono);
  font-size: 14px;
  transition: background .2s, border-color .2s;
}

.jb-cta-box .tg:hover { background: rgba(56, 189, 248, .1); border-color: var(--jb-sky); }

/* 入场 */
[data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity .7s, transform .7s; }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1000px) {
  .jb-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .jb-visual { order: -1; }
  .jb-visual img { width: min(100%, 360px); }
  .panel-inner { grid-template-columns: 1fr; }
  .jb-data { grid-template-columns: 1fr 1fr; }
  .release { grid-template-columns: 1fr; gap: 10px; }
  .jb-related { grid-template-columns: 1fr; }
  .jb-cta-box { grid-template-columns: 1fr; padding: 36px 28px; }
}

@media (max-width: 640px) {
  .jb-hero { padding: 48px 0 66px; }
  .jb-hero h1 { font-size: 29px; }
  .jb-actions .btn { width: 100%; }
  .tab-bar label { min-width: 100%; }
  .jb-section { padding: 60px 0; }
  .jb-data { grid-template-columns: 1fr; }
  .panel-inner { padding: 24px 20px; }
  .jb-visual .panel-float { position: static; width: 100%; margin-top: 18px; }
  .jb-cta-box .row .btn, .jb-cta-box .row .tg { width: 100%; }
}