/* =========================================================
   jbo-insight.com.cn — 共享样式 /assets/site.css
   01 设计令牌  02 复位  03 基础排版  04 布局  05 按钮
   06 标签  07 材质  08 步骤  09 图片窗口  10 面包屑
   11 页头  12 页脚  13 回到顶部  14 动效  15 响应式  16 降级
   ========================================================= */

/* ---------- 01 设计令牌 ---------- */
:root {
  --ink-abyss: #0A1626;
  --ink-archive: #12263D;
  --glass-fog: #1E3A52;
  --paper-cream: #F2EDE3;
  --cyan-pulse: #35E0D0;
  --amber-signal: #FF8A3D;
  --violet-index: #8E7BFF;
  --mute-slate: #7E93A6;
  --text-ink: #0E1A24;
  --mint-soft: #9AD9CF;

  --line-cool: rgba(53, 224, 208, 0.22);
  --line-dust: rgba(126, 147, 166, 0.22);
  --line-dust-soft: rgba(126, 147, 166, 0.12);
  --glass-bg: rgba(30, 58, 82, 0.58);
  --glass-bg-strong: rgba(30, 58, 82, 0.78);

  --font-sans: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-num: 'Space Grotesk', 'DIN Alternate', 'Helvetica Neue', ui-monospace, 'SF Mono', Menlo, monospace;

  --page-max: 1240px;
  --pad: clamp(18px, 4vw, 40px);
  --gap: 24px;
  --r: 4px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-deep: 0 22px 48px -30px rgba(0, 0, 0, 0.9);
}

/* ---------- 02 复位 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
  color-scheme: dark;
}

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

ul, ol { list-style: none; }

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

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

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

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

/* ---------- 03 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper-cream);
  background-color: var(--ink-abyss);
  background-image:
    repeating-linear-gradient(to right, rgba(126, 147, 166, 0.07) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(126, 147, 166, 0.07) 0 1px, transparent 1px 72px);
  -webkit-font-smoothing: antialiased;
}

body.is-locked { overflow: hidden; }

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 6vw, 64px); line-height: 1.05; }
h2 { font-size: clamp(26px, 4vw, 40px); }
h3 { font-size: clamp(19px, 2.4vw, 24px); line-height: 1.24; }

strong { font-weight: 700; }

::selection {
  background: var(--amber-signal);
  color: #20130A;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan-pulse);
  color: #04211F;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 12px; }

/* ---------- 04 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.shell__rail { min-width: 0; }
.shell__main { min-width: 0; }

@media (min-width: 960px) {
  .shell {
    grid-template-columns: minmax(120px, 2fr) minmax(0, 7fr);
    gap: calc(var(--gap) * 1.5);
    align-items: start;
  }
  .shell--wide { grid-template-columns: minmax(120px, 2fr) minmax(0, 10fr); }
}

.section { padding: clamp(44px, 7vw, 88px) 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  margin-bottom: clamp(18px, 3vw, 32px);
}

.section__title {
  font-size: clamp(23px, 3.4vw, 38px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.14;
}

.section__note {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mute-slate);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan-pulse);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: currentColor;
  flex: 0 0 auto;
}

.lede {
  max-width: 38ch;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
  color: rgba(242, 237, 227, 0.86);
}

.prose {
  max-width: 38em;
  color: var(--text-ink);
  line-height: 1.85;
}

.prose p + p { margin-top: 1em; }
.prose h3 { margin: 1.6em 0 0.5em; color: var(--text-ink); }
.prose ul { margin: 0.8em 0; }
.prose li { position: relative; padding-left: 1.3em; margin: 0.35em 0; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 2px;
  background: #0B6B63;
}
.prose a {
  color: #0B6B63;
  border-bottom: 1px solid currentColor;
}

.hairline {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-cool), var(--line-dust) 60%, transparent);
}

/* ---------- 05 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background 0.22s var(--ease), color 0.22s var(--ease),
    border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--amber-signal);
  color: #20130A;
}

.btn--primary:hover { background: #FFA463; }

.btn--ghost {
  border-color: var(--cyan-pulse);
  color: var(--cyan-pulse);
}

.btn--ghost:hover { background: rgba(53, 224, 208, 0.14); }

.btn--quiet {
  border-color: var(--line-dust);
  color: var(--paper-cream);
}

.btn--quiet:hover {
  border-color: var(--violet-index);
  color: var(--violet-index);
}

/* ---------- 06 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.7;
  border: 1px solid currentColor;
  border-radius: 2px;
  white-space: nowrap;
}

.tag--cyan { color: var(--cyan-pulse); }
.tag--amber { color: var(--amber-signal); }
.tag--violet { color: var(--violet-index); }
.tag--mute { color: var(--mute-slate); }

.plate .tag--cyan { color: #0B6B63; }
.plate .tag--amber { color: #9A4A12; }
.plate .tag--violet { color: #4B3BB8; }
.plate .tag--mute { color: #4C6072; }

/* ---------- 07 材质 ---------- */
.panel {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--line-cool);
  border-radius: var(--r);
  padding: clamp(18px, 2.6vw, 28px);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.plate {
  position: relative;
  background: var(--paper-cream);
  color: var(--text-ink);
  border-radius: var(--r);
  padding: clamp(22px, 3vw, 40px);
  box-shadow: var(--shadow-deep);
}

.plate h2,
.plate h3 { color: var(--text-ink); }

/* ---------- 08 步骤 ---------- */
.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line-dust);
}

.step__num {
  font-family: var(--font-num);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--cyan-pulse);
  font-variant-numeric: tabular-nums;
}

.step__body { min-width: 0; }

.step__title {
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.step__meta {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute-slate);
}

/* ---------- 09 图片窗口 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-cool);
  border-radius: var(--r);
  background-image: linear-gradient(135deg, var(--ink-archive), var(--glass-fog) 62%, var(--ink-archive));
  aspect-ratio: 16 / 10;
  min-height: 180px;
}

.media__frame {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(53, 224, 208, 0.14) 0 1px, transparent 1px 42px),
    repeating-linear-gradient(to bottom, rgba(53, 224, 208, 0.14) 0 1px, transparent 1px 42px);
  pointer-events: none;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  background: rgba(10, 22, 38, 0.84);
  color: var(--paper-cream);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.6;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--slant { clip-path: polygon(0 0, 100% 6%, 100% 100%, 0 94%); }

/* ---------- 10 面包屑 ---------- */
.crumbs {
  padding: 14px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute-slate);
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.crumbs__link {
  color: var(--mute-slate);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.crumbs__link:hover {
  color: var(--cyan-pulse);
  border-bottom-color: currentColor;
}

.crumbs__sep { color: rgba(126, 147, 166, 0.5); }

.crumbs__current { color: var(--paper-cream); }

/* ---------- 11 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink-abyss);
}

.readbar {
  position: relative;
  height: 3px;
  background: rgba(126, 147, 166, 0.18);
}

.readbar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-pulse), var(--amber-signal));
  transition: width 0.12s linear;
}

/* 状态条 */
.statusbar {
  background: rgba(30, 58, 82, 0.62);
  border-bottom: 1px solid var(--line-cool);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.statusbar__inner {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 5px var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute-slate);
  transition: padding 0.24s var(--ease);
}

.statusbar__left,
.statusbar__right {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.statusbar__beacon {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--cyan-pulse);
  box-shadow: 0 0 0 3px rgba(53, 224, 208, 0.18);
  animation: beacon-pulse 2.6s var(--ease) infinite;
}

@keyframes beacon-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.statusbar__code {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan-pulse);
  font-variant-numeric: tabular-nums;
}

.statusbar__label {
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper-cream);
  white-space: nowrap;
}

.statusbar__hint {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.statusbar__hint--mute { color: rgba(126, 147, 166, 0.78); }

.statusbar__sep {
  display: inline-block;
  width: 1px;
  height: 11px;
  background: rgba(126, 147, 166, 0.42);
  flex: 0 0 auto;
}

.site-header[data-scrolled] .statusbar__inner { padding-block: 2px; }
.site-header[data-scrolled] .statusbar__hint--mute { display: none; }

/* 署名层 */
.brandbar {
  background: var(--ink-abyss);
  border-bottom: 1px solid var(--line-dust-soft);
}

.brandbar__inner {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 14px var(--pad);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 28px;
  border: 1px solid var(--cyan-pulse);
  color: var(--cyan-pulse);
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  background: rgba(53, 224, 208, 0.08);
  flex: 0 0 auto;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-cream);
}

.brand__sub {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mute-slate);
}

.brandbar__claim {
  justify-self: end;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mute-slate);
  text-align: right;
}

/* 索引开关 */
.navtoggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line-cool);
  border-radius: 2px;
  background: rgba(53, 224, 208, 0.08);
  color: var(--paper-cream);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.navtoggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.navtoggle__bars span {
  display: block;
  height: 2px;
  background: var(--cyan-pulse);
  transition: transform 0.24s var(--ease), opacity 0.2s var(--ease);
}

.navtoggle__bars span:nth-child(2) { width: 72%; }

.site-header[data-open] .navtoggle {
  background: rgba(255, 138, 61, 0.14);
  border-color: rgba(255, 138, 61, 0.6);
}

.site-header[data-open] .navtoggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .navtoggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .navtoggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 栏目层 */
.navbar {
  background: var(--ink-archive);
  border-bottom: 1px solid var(--line-cool);
}

.navbar__inner {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: 0 var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.navlist {
  display: flex;
  align-items: stretch;
  gap: 2px;
  flex-wrap: wrap;
}

.navlist__item { flex: 0 0 auto; }

.navlink {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px 13px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: rgba(242, 237, 227, 0.82);
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.navlink__num {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--mute-slate);
  font-variant-numeric: tabular-nums;
  transition: color 0.2s var(--ease);
}

.navlink__txt { white-space: nowrap; }

.navlink:hover {
  color: var(--paper-cream);
  background: rgba(53, 224, 208, 0.09);
}

.navlink:hover .navlink__num { color: var(--cyan-pulse); }

.navlink[aria-current="page"] {
  color: #FFFFFF;
  border-bottom-color: var(--amber-signal);
}

.navlink[aria-current="page"] .navlink__num { color: var(--cyan-pulse); }

.navcta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: 1px solid rgba(142, 123, 255, 0.7);
  border-radius: 2px;
  background: rgba(142, 123, 255, 0.12);
  color: var(--paper-cream);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.navcta__tag {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--violet-index);
}

.navcta:hover {
  background: rgba(142, 123, 255, 0.26);
  border-color: var(--violet-index);
}

.navbar__legend { display: none; }

.navbar__legendkey {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mute-slate);
}

.navbar__legendkey::before {
  content: "";
  width: 8px;
  height: 8px;
  background: currentColor;
  flex: 0 0 auto;
}

.navbar__legendkey--amber { color: var(--amber-signal); }
.navbar__legendkey--cyan { color: var(--cyan-pulse); }
.navbar__legendkey--violet { color: var(--violet-index); }

.navscrim {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(10, 22, 38, 0.74);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  border: 0;
}

.navscrim[hidden] { display: none; }

/* ---------- 12 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--ink-abyss), #081120);
  border-top: 1px solid var(--line-dust);
  color: var(--paper-cream);
}

.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background:
    linear-gradient(90deg,
      var(--cyan-pulse) 0 22%,
      transparent 22% 24%,
      var(--amber-signal) 24% 46%,
      transparent 46% 48%,
      var(--violet-index) 48% 60%,
      transparent 60%);
}

.footer__inner {
  max-width: var(--page-max);
  margin-inline: auto;
  padding: clamp(36px, 5.5vw, 68px) var(--pad) 0;
}

.footer__masthead {
  padding-bottom: clamp(22px, 3vw, 32px);
  border-bottom: 1px solid var(--line-dust);
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 21px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.footer__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 26px;
  border: 1px solid var(--cyan-pulse);
  color: var(--cyan-pulse);
  font-family: var(--font-num);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  flex: 0 0 auto;
}

.footer__claim {
  margin-top: 12px;
  max-width: 48ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mute-slate);
}

.footer__sig {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(126, 147, 166, 0.78);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(26px, 4vw, 44px) 0;
}

.footcol { min-width: 0; }

.footcol__title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-dust);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--paper-cream);
}

.footcol__title::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--amber-signal);
}

.footcol:nth-child(2) .footcol__title::before { background: var(--cyan-pulse); }
.footcol:nth-child(3) .footcol__title::before { background: var(--violet-index); }
.footcol:nth-child(4) .footcol__title::before { background: var(--mint-soft); }

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

.footcol__link {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: rgba(242, 237, 227, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footcol__link:hover {
  color: var(--cyan-pulse);
  border-bottom-color: currentColor;
}

.footcol__list--contact { gap: 10px; }

.footcol__contact {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.footcol__key {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan-pulse);
}

.footcol__val {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(242, 237, 227, 0.9);
  word-break: break-all;
}

.footcol__note {
  margin-top: 12px;
  max-width: 32ch;
  font-size: 12px;
  line-height: 1.75;
  color: var(--mute-slate);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 16px 0 26px;
  border-top: 1px solid var(--line-dust);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute-slate);
}

.footer__meta--icp {
  font-family: var(--font-num);
  letter-spacing: 0.08em;
  color: rgba(126, 147, 166, 0.86);
}

/* ---------- 13 回到顶部 ---------- */
.totop {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  border: 1px solid var(--line-cool);
  border-radius: 2px;
  background: var(--glass-bg-strong);
  color: var(--paper-cream);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow-deep);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.22s var(--ease), color 0.22s var(--ease);
}

.totop__arrow {
  font-family: var(--font-num);
  color: var(--cyan-pulse);
}

.totop:hover {
  background: var(--cyan-pulse);
  color: #052B28;
}

.totop:hover .totop__arrow { color: #052B28; }

.totop[hidden] { display: none; }

/* ---------- 14 动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 15 响应式 ---------- */
@media (max-width: 1080px) {
  .navlink { padding-inline: 10px; font-size: 14px; }
  .brandbar__claim { display: none; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 108px; }

  .brandbar__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-block: 12px;
    min-height: 64px;
  }

  .navtoggle { display: inline-flex; }

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 40;
    width: min(86vw, 336px);
    max-height: 100dvh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 108px 18px 30px;
    background: linear-gradient(180deg, rgba(18, 38, 61, 0.985), rgba(10, 22, 38, 0.995));
    border-right: 1px solid var(--line-cool);
    border-bottom: 0;
    box-shadow: 26px 0 64px -44px #000;
    transform: translateX(-102%);
    transition: transform 0.28s var(--ease);
  }

  .site-header[data-open] .navbar { transform: none; }

  .navbar__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    padding: 0;
    width: 100%;
  }

  .navlist {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .navlist__item { width: 100%; }

  .navlink {
    width: 100%;
    align-items: baseline;
    justify-content: flex-start;
    padding: 14px 14px;
    border-bottom: 1px solid var(--line-dust-soft);
    border-left: 3px solid transparent;
    font-size: 15px;
  }

  .navlink--amber { border-left-color: rgba(255, 138, 61, 0.75); }
  .navlink--cyan { border-left-color: rgba(53, 224, 208, 0.75); }
  .navlink--violet { border-left-color: rgba(142, 123, 255, 0.75); }

  .navlink[aria-current="page"] {
    background: rgba(255, 138, 61, 0.1);
    border-bottom-color: var(--line-dust-soft);
    border-left-color: var(--amber-signal);
  }

  .navcta {
    justify-content: center;
    width: 100%;
    padding: 12px 16px;
  }

  .navbar__legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    padding-top: 14px;
    border-top: 1px solid var(--line-dust);
    margin-top: auto;
  }

  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  body { font-size: 16px; }
  .statusbar__hint--mute,
  .statusbar__sep { display: none; }
  .footer__cols { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .footer__legal { flex-direction: column; align-items: flex-start; }
  .step__num { font-size: 34px; }
}

@media (max-width: 420px) {
  .brand__name { font-size: 18px; }
  .brand__sub { letter-spacing: 0.1em; }
  .statusbar__inner { font-size: 11px; letter-spacing: 0.05em; }
}

/* ---------- 16 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .js [data-reveal],
  .js [data-reveal].is-in {
    opacity: 1;
    transform: none;
  }

  .navbar { transition: none; }
  .readbar__fill { transition: none; }
}