/* ============================================================
   九博体育 · 共享外壳样式  /assets/site.css
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ---------- Tokens ---------- */
:root {
  --jb-ink: #060B1E;
  --jb-layer: #0E1A3E;
  --jb-line: #1E2F63;
  --jb-line-soft: #16244C;
  --jb-cyan: #22D3EE;
  --jb-mist: #A5F3FC;
  --jb-orange: #FF6B1A;
  --jb-orange-deep: #160A02;
  --jb-magenta: #E5257B;
  --jb-purple: #8B5CF6;
  --jb-gold: #F5C24B;
  --jb-text: #E8EDF7;
  --jb-text-dim: #B9C6E4;
  --jb-text-mute: #7E8DB8;
  --jb-paper: #F4F7FD;
  --jb-paper-ink: #0B1436;
  --jb-green: #3DDC97;

  --jb-hard: 8px 8px 0 #01040E;
  --jb-hard-sm: 4px 4px 0 #01040E;
  --jb-hard-lg: 14px 14px 0 #01040E;

  --jb-radius: 4px;
  --jb-pill: 999px;
  --jb-wrap: 1320px;
  --jb-gutter: 20px;
  --jb-ease: cubic-bezier(.2, .8, .2, 1);

  --jb-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --jb-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

/* ---------- 中文排版与页面基调 ---------- */
html { background-color: var(--jb-ink); }
body {
  min-height: 100vh;
  font-family: var(--jb-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--jb-text);
  background-color: var(--jb-ink);
  overflow-x: hidden;
  font-variant-numeric: tabular-nums;
}
body::before {
  content: "";
  position: fixed;
  inset: -8%;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 47, 99, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 47, 99, .30) 1px, transparent 1px);
  background-size: 64px 64px;
  animation: jb-drift 8s ease-in-out infinite;
}
@keyframes jb-drift {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(1.5%, -1.5%, 0); }
}
#main-content { position: relative; z-index: 1; }

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

/* ---------- 布局工具 ---------- */
.jb-wrap {
  width: 100%;
  max-width: var(--jb-wrap);
  margin-inline: auto;
  padding-inline: var(--jb-gutter);
}
.jb-section { position: relative; padding-block: clamp(52px, 8vw, 108px); }
.jb-grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.jb-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.jb-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.jb-grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.jb-grid--split-r { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.jb-slash { position: relative; }
.jb-slash--top {
  clip-path: polygon(0 3.2vw, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(3.2vw + 26px);
}
.jb-slash--bottom {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3.2vw), 0 100%);
  padding-bottom: calc(3.2vw + 26px);
}

/* ---------- 通用按钮 ---------- */
.jb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-pill);
  background: rgba(14, 26, 62, .6);
  color: var(--jb-text);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .01em;
  line-height: 1.2;
  white-space: nowrap;
  transition: transform .2s var(--jb-ease), box-shadow .2s var(--jb-ease),
              border-color .2s ease, background .2s ease, color .2s ease;
}
.jb-btn--primary {
  background: linear-gradient(135deg, var(--jb-orange) 0%, #FF9A3D 100%);
  border-color: #FFB273;
  color: var(--jb-orange-deep);
  box-shadow: var(--jb-hard-sm);
}
.jb-btn--primary:hover { transform: translateY(-3px); box-shadow: var(--jb-hard); }
.jb-btn--ghost {
  background: transparent;
  border-color: var(--jb-cyan);
  color: var(--jb-mist);
}
.jb-btn--ghost:hover {
  background: rgba(34, 211, 238, .12);
  transform: translateY(-3px);
  box-shadow: 6px 6px 0 #01040E;
}
.jb-btn--gold {
  background: rgba(245, 196, 75, .12);
  border-color: rgba(245, 196, 75, .7);
  color: var(--jb-gold);
}
.jb-btn--gold:hover { background: rgba(245, 196, 75, .2); transform: translateY(-3px); }

/* ---------- 标签 ---------- */
.jb-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--jb-line);
  border-radius: var(--jb-pill);
  background: rgba(165, 243, 252, .08);
  color: var(--jb-mist);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
}
.jb-chip--gold {
  border-color: rgba(245, 196, 75, .5);
  background: rgba(245, 196, 75, .1);
  color: var(--jb-gold);
}
.jb-chip--neon {
  border-color: rgba(229, 37, 123, .5);
  background: linear-gradient(135deg, rgba(229, 37, 123, .2), rgba(139, 92, 246, .2));
  color: #FF9BC8;
}
.jb-chip--live {
  border-color: rgba(61, 220, 151, .5);
  background: rgba(61, 220, 151, .1);
  color: var(--jb-green);
}

/* ---------- 卡片 ---------- */
.jb-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-radius);
  background: linear-gradient(160deg, rgba(14, 26, 62, .95), rgba(9, 16, 40, .9));
  box-shadow: var(--jb-hard);
  transition: transform .22s var(--jb-ease), box-shadow .22s var(--jb-ease), border-color .22s ease;
}
.jb-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--jb-hard-lg);
  border-color: var(--jb-cyan);
}
.jb-card--paper {
  background: var(--jb-paper);
  color: var(--jb-paper-ink);
  border-color: #C9D6F2;
  box-shadow: 8px 8px 0 rgba(1, 4, 14, .9);
}
.jb-card--paper :focus-visible { outline-color: var(--jb-paper-ink); }

/* ---------- 图片容器 ---------- */
.jb-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-radius);
  background:
    linear-gradient(135deg, #12224F 0%, #0E1A3E 45%, #060B1E 100%);
  box-shadow: var(--jb-hard);
}
.jb-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.jb-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 11, 30, 0) 42%, rgba(6, 11, 30, .86) 100%);
}
.jb-frame--wide { aspect-ratio: 21 / 9; }
.jb-frame--tall { aspect-ratio: 3 / 4; }
.jb-frame--square { aspect-ratio: 1 / 1; }
.jb-frame--bleed { margin-right: clamp(-72px, -6vw, -18px); }
.jb-frame__cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  font-family: var(--jb-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--jb-mist);
}

/* ---------- 编号章节标记 ---------- */
.jb-mark { display: grid; gap: 10px; margin-bottom: clamp(22px, 3vw, 40px); }
.jb-mark__num {
  font-size: clamp(56px, 9vw, 132px);
  font-weight: 250;
  line-height: .95;
  letter-spacing: -.03em;
  font-family: var(--jb-mono);
  background: linear-gradient(135deg, #E8EDF7 0%, rgba(34, 211, 238, .7) 58%, rgba(229, 37, 123, .6) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.jb-mark__title {
  font-size: clamp(22px, 2.6vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.25;
}
.jb-mark__line {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--jb-text-mute);
}

/* ---------- 面包屑 ---------- */
.jb-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--jb-text-mute);
}
.jb-breadcrumb a { transition: color .2s ease; }
.jb-breadcrumb a:hover { color: var(--jb-cyan); }
.jb-breadcrumb__sep { color: var(--jb-line); }

/* ---------- 正文容器 ---------- */
.jb-prose { max-width: 68ch; font-size: 17px; line-height: 1.75; color: var(--jb-text); }
.jb-prose p + p { margin-top: 16px; }
.jb-prose h2, .jb-prose h3 { font-weight: 600; letter-spacing: -.01em; line-height: 1.3; }
.jb-prose h2 { font-size: clamp(22px, 2.4vw, 30px); margin-top: 36px; }
.jb-prose h3 { font-size: clamp(18px, 1.8vw, 22px); margin-top: 28px; }
.jb-prose ul, .jb-prose ol { margin-top: 14px; display: grid; gap: 8px; }
.jb-prose li { position: relative; padding-left: 22px; }
.jb-prose li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 8px;
  height: 2px;
  background: var(--jb-cyan);
}
.jb-prose strong { font-weight: 800; color: var(--jb-mist); }
.jb-prose a { color: var(--jb-cyan); border-bottom: 1px solid rgba(34, 211, 238, .45); }

/* ---------- 步骤树（技能树式服务路径） ---------- */
.jb-steps { display: grid; gap: 14px; }
.jb-step {
  position: relative;
  padding: 18px 22px 18px 68px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-radius);
  background: linear-gradient(150deg, rgba(14, 26, 62, .9), rgba(9, 16, 40, .76));
  transition: transform .22s var(--jb-ease), border-color .22s ease;
}
.jb-step:hover { transform: translateX(4px); border-color: rgba(34, 211, 238, .6); }
.jb-step__num {
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--jb-mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--jb-gold);
}
.jb-step__title { font-size: 17px; font-weight: 800; letter-spacing: -.01em; margin-bottom: 4px; }

/* ---------- 展开组 ---------- */
.jb-accordion { display: block; }
.jb-acc {
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-radius);
  background: rgba(14, 26, 62, .66);
  overflow: hidden;
}
.jb-acc + .jb-acc { margin-top: 12px; }
.jb-acc__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  text-align: left;
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 600;
  color: var(--jb-text);
  transition: background .2s ease;
}
.jb-acc__trigger:hover { background: rgba(34, 211, 238, .07); }
.jb-acc__icon {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-radius);
  color: var(--jb-cyan);
  font-weight: 800;
  line-height: 1;
  transition: transform .22s var(--jb-ease), border-color .22s ease;
}
.jb-acc__trigger[aria-expanded="true"] .jb-acc__icon { transform: rotate(45deg); border-color: var(--jb-cyan); }
.jb-acc__panel { display: none; padding: 0 20px 20px; font-size: 16px; color: var(--jb-text-dim); }
.jb-acc__panel[data-open] { display: block; animation: jb-fade .22s var(--jb-ease); }

/* ---------- 切换组 ---------- */
.jb-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}
.jb-tab {
  flex: 0 0 auto;
  padding: 8px 16px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-pill);
  color: var(--jb-text-dim);
  font-size: 14px;
  font-weight: 600;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.jb-tab:hover { color: var(--jb-text); border-color: rgba(34, 211, 238, .5); }
.jb-tab.is-active {
  border-color: var(--jb-cyan);
  background: rgba(34, 211, 238, .14);
  color: var(--jb-cyan);
}
.jb-panel { display: none; }
.jb-panel[data-open] { display: block; animation: jb-fade .22s var(--jb-ease); }

@keyframes jb-fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- 显现 ---------- */
.jb-reveal,
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .3s var(--jb-ease), transform .3s var(--jb-ease);
}
.jb-reveal.is-in,
[data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 跳转链接 ---------- */
.jb-skip {
  position: fixed;
  top: 8px;
  left: 50%;
  z-index: 120;
  padding: 10px 18px;
  border: 2px solid #0B1330;
  border-radius: var(--jb-pill);
  background: var(--jb-cyan);
  color: #08152E;
  font-size: 14px;
  font-weight: 800;
  transform: translate(-50%, -160%);
  transition: transform .2s var(--jb-ease);
}
.jb-skip:focus { transform: translate(-50%, 0); }

/* ---------- 头部：悬浮胶囊导航 ---------- */
.jb-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding: 14px var(--jb-gutter) 0;
  transition: padding .25s var(--jb-ease);
}
.jb-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--jb-wrap);
  margin-inline: auto;
  padding: 10px 12px 10px 16px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-pill);
  background: rgba(14, 26, 62, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 12px 30px rgba(2, 5, 16, .5);
  transition: background .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.jb-header[data-stuck] { padding-top: 8px; }
.jb-header[data-stuck] .jb-header__inner {
  background: rgba(8, 14, 34, .94);
  border-color: #27407F;
  box-shadow: 5px 5px 0 #01040E, 0 0 0 1px rgba(34, 211, 238, .12);
}

.jb-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  min-width: 0;
}
.jb-brand__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 2px solid #0B1330;
  border-radius: var(--jb-radius);
  background: linear-gradient(135deg, var(--jb-cyan) 0%, var(--jb-orange) 100%);
  box-shadow: 3px 3px 0 #01040E;
  color: var(--jb-orange-deep);
  font-size: 18px;
  font-weight: 800;
  line-height: 1;
}
.jb-brand__text { display: grid; gap: 2px; min-width: 0; }
.jb-brand__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.15;
  color: #FFFFFF;
}
.jb-brand__tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  line-height: 1.2;
  color: var(--jb-text-mute);
  white-space: nowrap;
}

.jb-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.jb-nav__list { display: flex; align-items: center; gap: 2px; }
.jb-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border: 2px solid transparent;
  border-radius: var(--jb-pill);
  color: var(--jb-text-dim);
  font-size: 14.5px;
  font-weight: 500;
  line-height: 1.3;
  white-space: nowrap;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}
.jb-nav__link:hover {
  color: #FFFFFF;
  border-color: rgba(34, 211, 238, .35);
  background: rgba(34, 211, 238, .08);
}
.jb-nav__link[aria-current="page"] {
  border-color: var(--jb-cyan);
  background: rgba(34, 211, 238, .14);
  color: var(--jb-cyan);
  font-weight: 800;
}
.jb-nav__cta { display: flex; align-items: center; gap: 8px; margin-left: 12px; }

.jb-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 2px solid var(--jb-cyan);
  border-radius: var(--jb-pill);
  background: rgba(34, 211, 238, .1);
  color: var(--jb-mist);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
}
.jb-nav-toggle__bars { display: grid; gap: 4px; }
.jb-nav-toggle__bars i {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--jb-ease);
}
.jb-header[data-open] .jb-nav-toggle__bars i:first-child { transform: translateY(3px) rotate(45deg); }
.jb-header[data-open] .jb-nav-toggle__bars i:last-child { transform: translateY(-3px) rotate(-45deg); }
.jb-nav-toggle__label { line-height: 1; }

/* 阅读进度 */
.jb-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(30, 47, 99, .55);
  overflow: hidden;
}
.jb-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--jb-cyan) 0%, var(--jb-orange) 55%, var(--jb-magenta) 100%);
}

.jb-lock { overflow: hidden; }

/* ---------- 页脚 ---------- */
.jb-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(48px, 7vw, 110px);
  padding-top: clamp(48px, 7vw, 88px);
  border-top: 2px solid var(--jb-line);
  background: linear-gradient(180deg, rgba(14, 26, 62, 0) 0%, #0A1230 24%, #070D22 100%);
  overflow: hidden;
}
.jb-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg, var(--jb-cyan), rgba(34, 211, 238, 0));
}
.jb-footer__glow {
  position: absolute;
  inset: auto -12% -34% -12%;
  height: 360px;
  pointer-events: none;
  background:
    radial-gradient(60% 100% at 18% 100%, rgba(34, 211, 238, .18), transparent 70%),
    radial-gradient(52% 100% at 86% 100%, rgba(229, 37, 123, .16), transparent 70%);
}
.jb-footer__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.7fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 64px);
  padding-bottom: clamp(36px, 5vw, 64px);
}
.jb-footer__brand { display: grid; gap: 14px; align-content: start; }
.jb-footer__logo {
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 250;
  letter-spacing: -.03em;
  line-height: 1;
  color: #FFFFFF;
}
.jb-footer__line { font-size: 14.5px; line-height: 1.75; color: var(--jb-text-dim); max-width: 34ch; }
.jb-footer__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }

.jb-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 32px);
}
.jb-footer__col { display: grid; gap: 12px; align-content: start; }
.jb-footer__col-title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--jb-cyan);
}
.jb-footer__list { display: grid; gap: 9px; }
.jb-footer__link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--jb-text-dim);
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease, transform .2s var(--jb-ease);
}
.jb-footer__link:hover {
  color: var(--jb-cyan);
  border-bottom-color: rgba(34, 211, 238, .6);
  transform: translateX(3px);
}

.jb-footer__contact { display: grid; gap: 14px; align-content: start; }
.jb-footer__contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
}
.jb-footer__contact-row--wide { align-items: flex-start; }
.jb-footer__key {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--jb-text-mute);
  flex: 0 0 auto;
}
.jb-footer__value { color: var(--jb-text); word-break: break-word; }

.jb-copy {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  border: 2px solid var(--jb-line);
  border-radius: var(--jb-pill);
  background: rgba(34, 211, 238, .06);
  color: var(--jb-mist);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.5;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.jb-copy:hover { border-color: var(--jb-cyan); }
.jb-copy[data-copied] {
  border-color: var(--jb-green);
  background: rgba(61, 220, 151, .12);
  color: var(--jb-green);
}

.jb-footer__base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-block: 20px 26px;
  border-top: 1px dashed var(--jb-line);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--jb-text-mute);
}
.jb-footer__legal { font-family: var(--jb-mono); letter-spacing: .06em; }
.jb-footer__copy { letter-spacing: .08em; }

/* ---------- 返回顶部 ---------- */
.jb-totop {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border: 2px solid var(--jb-cyan);
  border-radius: var(--jb-pill);
  background: rgba(8, 14, 34, .94);
  color: var(--jb-mist);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  box-shadow: 6px 6px 0 #01040E;
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .24s var(--jb-ease), transform .24s var(--jb-ease);
}
.jb-totop[data-visible] { opacity: 1; transform: none; pointer-events: auto; }

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 768px) {
  :root { --jb-gutter: 40px; }
}

@media (max-width: 1180px) {
  .jb-brand__tag { display: none; }
  .jb-nav__link { padding: 8px 10px; font-size: 14px; }
}

@media (max-width: 959px) {
  body { font-size: 16px; }
  :root { --jb-gutter: 20px; }

  .jb-header { padding: 10px 16px 0; }
  .jb-header[data-stuck] { padding-top: 6px; }
  .jb-header__inner { padding: 9px 10px 9px 12px; border-radius: 26px; gap: 10px; }
  .jb-brand__mark { width: 34px; height: 34px; font-size: 16px; }
  .jb-brand__name { font-size: 16px; }

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

  .jb-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin: 0;
    padding: 14px;
    border: 2px solid var(--jb-line);
    border-radius: 22px;
    background: rgba(7, 12, 30, .98);
    box-shadow: 8px 8px 0 #01040E;
  }
  .jb-header[data-open] .jb-nav { display: flex; animation: jb-drop .22s var(--jb-ease); }
  .jb-nav__list { flex-direction: column; align-items: stretch; gap: 2px; width: 100%; }
  .jb-nav__link { padding: 12px 14px; border-radius: 12px; font-size: 16px; }
  .jb-nav__link[aria-current="page"] { border-radius: 12px; }
  .jb-nav__cta { flex-direction: column; align-items: stretch; gap: 8px; margin: 8px 0 0; }
  .jb-nav__cta .jb-btn { width: 100%; padding: 12px 18px; }

  .jb-grid--2,
  .jb-grid--3,
  .jb-grid--split,
  .jb-grid--split-r { grid-template-columns: minmax(0, 1fr); }

  .jb-slash--top,
  .jb-slash--bottom { clip-path: none; padding-block: clamp(40px, 9vw, 64px); }

  .jb-frame--bleed { margin-right: 0; }

  .jb-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .jb-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .jb-footer__line { max-width: 46ch; }
  .jb-totop { right: 14px; bottom: 16px; padding: 10px 14px; }
}

@keyframes jb-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 560px) {
  .jb-footer__cols { grid-template-columns: minmax(0, 1fr); }
  .jb-footer__base { justify-content: flex-start; }
  .jb-mark__num { font-size: clamp(48px, 16vw, 84px); }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  body::before { animation: none; }
  .jb-reveal,
  [data-reveal] { opacity: 1; transform: none; }
  .jb-card:hover { transform: none; }
  .jb-step:hover { transform: none; }
  .jb-btn:hover { transform: none; }
}