/* Trust 说明档案 · 手册式布局 */
:root {
  --nav-width: 19rem;
  --nav-bg: #0f1c2e;
  --nav-bg-sub: #0a1422;
  --nav-text: #c5d0e0;
  --nav-text-dim: #7a8aa0;
  --nav-accent: #3d9be9;
  --nav-accent-soft: rgba(61, 155, 233, 0.18);
  --paper: #f6f8fb;
  --paper-card: #ffffff;
  --ink: #1a2332;
  --ink-muted: #5c6b7d;
  --rule: #d8dee8;
  --rule-light: #e8ecf2;
  --accent-blue: #1e5a8e;
  --accent-cyan: #2a9db8;
  --silver: #9aa8b8;
  --shadow-soft: 0 12px 40px rgba(15, 28, 46, 0.08);
  --font-sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: 0.22s ease;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--accent-cyan);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  padding: 0.75rem 1rem;
  background: var(--nav-bg);
  color: #fff;
}

.skip-link:focus {
  left: 0;
}

/* —— 左侧导航：页面核心视觉结构 —— */
.side-nav-wrap {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  z-index: 900;
}

.side-nav {
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--nav-bg) 0%, var(--nav-bg-sub) 100%);
  color: var(--nav-text);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 0 1rem;
  border-right: 2px solid rgba(61, 155, 233, 0.25);
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
  overflow-y: auto;
}

.side-nav-brand {
  padding: 0 1.1rem 1.1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-link:hover {
  color: #fff;
}

.brand-logo {
  width: 2.25rem;
  height: 2.25rem;
  object-fit: contain;
  flex-shrink: 0;
}

.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--nav-accent) 0%, #2563a8 100%);
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-mark--sm {
  width: 2rem;
  height: 2rem;
  font-size: 0.95rem;
}

.side-nav-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--nav-text-dim);
  margin: 0.65rem 1.1rem 0.35rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: #fff;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--nav-text-dim);
  line-height: 1.3;
}

.side-nav-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0 0.65rem;
  flex: 1;
}

.side-nav-list li {
  margin: 0;
}

.nav-anchor {
  display: block;
  padding: 0.55rem 0.65rem 0.55rem 0.85rem;
  margin-bottom: 2px;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 0.8125rem;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform 0.2s ease;
}

.nav-anchor:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  transform: translateX(2px);
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.nav-anchor.is-active {
  background: var(--nav-accent-soft);
  color: #fff;
  border-left-color: var(--nav-accent);
}

.side-nav-foot {
  padding: 1rem 1.1rem 0;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.side-nav-note {
  font-size: 0.72rem;
  color: var(--nav-text-dim);
  line-height: 1.55;
  margin: 0 0 0.75rem;
}

.side-nav-note strong {
  color: var(--nav-text);
  font-weight: 600;
}

.side-nav-cta {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.45rem 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: background var(--transition), border-color var(--transition), transform 0.2s ease;
}

.side-nav-cta:hover {
  background: rgba(61, 155, 233, 0.25);
  border-color: var(--nav-accent);
  transform: translateY(-1px);
}

.cap-card {
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.cap-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(15, 28, 46, 0.12);
}

/* 移动端顶栏与抽屉 */
.nav-toggle {
  display: none;
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 950;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--nav-bg);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow: var(--shadow-soft);
}

.nav-toggle-bar {
  display: block;
  width: 1.15rem;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 20, 34, 0.45);
  z-index: 920;
}

.nav-overlay.is-visible {
  display: block;
}

/* —— 主内容区 —— */
.manual-main {
  margin-left: var(--nav-width);
  min-height: 100vh;
  background: var(--paper);
}

.manual-article {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2.5rem 2.25rem 0;
}

.manual-section {
  padding-bottom: 3.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--rule-light);
  scroll-margin-top: 1.25rem;
}

.manual-section:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
}

.section-header {
  margin-bottom: 1.75rem;
}

.section-header--accent {
  padding: 1.75rem 1.75rem 1.5rem;
  background: var(--paper-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-soft);
  margin-bottom: 2rem;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-cyan);
  margin: 0 0 0.5rem;
}

.manual-h1 {
  font-size: clamp(1.65rem, 4vw, 2.05rem);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.25;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.manual-h2 {
  font-size: clamp(1.35rem, 3vw, 1.6rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 0.65rem;
  letter-spacing: -0.015em;
}

.manual-h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.5rem;
}

.section-dek,
.lead-text {
  font-size: 0.98rem;
  color: var(--ink-muted);
  margin: 0;
  max-width: 48rem;
}

.lead-text {
  margin-bottom: 1.35rem;
}

.entry-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background: var(--accent-blue);
  color: #fff;
  border: 1px solid var(--accent-blue);
}

.btn-primary:hover {
  background: #164a73;
  color: #fff;
}

.btn-glow {
  box-shadow: 0 0 20px rgba(61, 155, 233, 0.4);
  animation: btn-pulse 2s ease-in-out infinite;
}

@keyframes btn-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(61, 155, 233, 0.4); }
  50% { box-shadow: 0 0 28px rgba(61, 155, 233, 0.6); }
}

.btn-ghost {
  background: transparent;
  color: var(--accent-blue);
  border: 1px solid var(--rule);
}

.btn-ghost:hover {
  border-color: var(--accent-blue);
  background: rgba(30, 90, 142, 0.06);
}

.entry-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 1.75rem;
  align-items: start;
}

.entry-figure {
  margin: 0;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.entry-figure figcaption {
  font-size: 0.8rem;
  color: var(--ink-muted);
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--rule-light);
  line-height: 1.5;
}

.entry-aside {
  background: #eef2f7;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.2rem;
}

.aside-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin: 0 0 0.75rem;
}

.entry-list {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.875rem;
  color: var(--ink-muted);
}

.entry-list li {
  margin-bottom: 0.5rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.prose-block p {
  margin: 0 0 0.85rem;
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.inline-figure {
  margin: 1.75rem 0 0;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.inline-figure figcaption {
  font-size: 0.8rem;
  color: var(--ink-muted);
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--rule-light);
}

/* 能力分区：条目行 */
.capability-rows {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--paper-card);
  margin-bottom: 2rem;
}

.cap-row {
  display: flex;
  gap: 1rem;
  padding: 1.15rem 1.25rem;
  border-bottom: 1px solid var(--rule-light);
  align-items: flex-start;
}

.cap-row:last-child {
  border-bottom: none;
}

.cap-row-icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eef4fa;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-blue);
}

.cap-row-icon img {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--accent-blue);
}

.cap-row-body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

/* 能力卡片：交错 */
.capability-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.75rem;
}

.cap-card {
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(15, 28, 46, 0.04);
}

.cap-card--offset {
  margin-top: 1.75rem;
}

.cap-card-inner {
  padding: 1rem 1.1rem;
}

.cap-card-inner .manual-h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
}

.cap-card-inner p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.cap-notes {
  padding: 1rem 1.15rem;
  background: #f0f3f8;
  border-radius: var(--radius-md);
  border: 1px solid var(--rule-light);
}

.cap-notes p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

/* 使用顺序：步骤 */
.flow-steps {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  border-left: 2px solid var(--accent-blue);
  margin-left: 0.5rem;
}

.flow-steps > li {
  position: relative;
  padding: 0 0 1.5rem 1.75rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.flow-steps > li:last-child {
  padding-bottom: 0;
}

.flow-step-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.05em;
  min-width: 2rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.flow-step-body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

/* 图片：等比例缩小，完整展示主体，不过大不过宽 */
.img-contained-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.img-contained {
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.entry-figure .img-contained-wrap .img-contained,
.inline-figure .img-contained-wrap .img-contained { max-width: 85%; margin: 0 auto; }
.cap-card-img-wrap .img-contained,
.security-figure .img-contained-wrap .img-contained { max-width: 90%; margin: 0 auto; }
.scene-img-wrap .img-contained,
.scene-card .scene-img-wrap .img-contained { max-width: 75%; margin: 0 auto; }
.app-poster-track .img-contained { max-width: 100%; }

@media (max-width: 768px) {
  .entry-figure .img-contained,
  .inline-figure .img-contained,
  .cap-card-img-wrap .img-contained,
  .security-figure .img-contained,
  .scene-img-wrap .img-contained,
  .img-contained-wrap .img-contained { max-width: 100% !important; }
}

/* 章节标题图标 */
.section-header-icon {
  margin-bottom: 0.5rem;
}

.section-header-icon img {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--accent-blue);
}

.inline-icon,
.aside-icon {
  vertical-align: -0.25em;
  margin-right: 0.35rem;
  opacity: 0.85;
}

.aside-icon {
  margin-right: 0.25rem;
}

/* 能力行图标 */
/* 流程步骤图标 */
.flow-step-index {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-step-icon {
  width: 1rem;
  height: 1rem;
  color: var(--accent-blue);
}

/* 安全规则图标 */
.security-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.rule-icon {
  flex-shrink: 0;
  margin-top: 0.2rem;
  color: var(--accent-blue);
}

/* 说明备注图标 */
.cap-notes {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.note-icon {
  flex-shrink: 0;
  margin-top: 0.15rem;
  color: var(--accent-cyan);
}

.cap-card-img-wrap {
  padding: 0.75rem;
  background: #f8f9fb;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 12rem;
}

.scene-img-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem;
  background: #f8f9fb;
}

/* appzh 海报轮播：横向滚动 */
.app-poster-carousel {
  margin-top: 1.5rem;
  overflow: hidden;
}

.app-poster-track {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.5rem;
}

.app-poster-track::-webkit-scrollbar {
  height: 6px;
}

.app-poster-track::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 3px;
}

.app-poster-track figure {
  flex: 0 0 auto;
  margin: 0;
  width: min(280px, 60vw);
  scroll-snap-align: start;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: center;
}

.app-poster-track img {
  width: 100%;
  height: auto;
  display: block;
}

.app-poster-dots {
  display: none;
}

/* 安全区 */
.section-security {
  background: linear-gradient(180deg, #e8edf4 0%, var(--paper) 100%);
  margin-left: -2.25rem;
  margin-right: -2.25rem;
  padding-left: 2.25rem;
  padding-right: 2.25rem;
  padding-top: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule-light);
}

.security-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 1.75rem;
  align-items: start;
}

.security-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid #c5ced9;
}

.security-rules ul {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 0.92rem;
  color: #2d3a4d;
  line-height: 1.7;
}

.security-rules li {
  margin-bottom: 0.65rem;
}

/* 场景 */
.scene-pair {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.scene-card {
  margin: 0;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
  align-items: stretch;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.scene-card--reverse {
  grid-template-columns: 0.9fr 1.1fr;
}

.scene-card--reverse img {
  order: 2;
}

.scene-card--reverse .scene-card-body {
  order: 1;
}

.scene-card-body {
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.scene-card-body p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

/* 术语表 */
.section-glossary {
  background: var(--paper-card);
  padding: 2rem 1.75rem;
  margin-left: -1rem;
  margin-right: -1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow-soft);
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin: 0;
}

.glossary-item {
  padding: 1.1rem 1.15rem;
  border-bottom: 1px solid var(--rule-light);
  border-right: 1px solid var(--rule-light);
}

.glossary-item:nth-child(2n) {
  border-right: none;
}

.glossary-item:nth-last-child(-n + 2) {
  border-bottom: none;
}

.glossary-item dt {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-blue);
  margin-bottom: 0.45rem;
}

.glossary-item dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

/* 释疑：手册边栏式 */
.qna-board {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--paper-card);
}

.qna-item {
  border-bottom: 1px solid var(--rule-light);
}

.qna-item:last-child {
  border-bottom: none;
}

.qna-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.15rem;
  background: #fafbfd;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 0.92rem;
  color: var(--ink);
  transition: background var(--transition);
}

.qna-trigger:hover {
  background: #f0f4fa;
}

.qna-trigger[aria-expanded="true"] {
  background: #eef4fa;
  border-bottom: 1px solid var(--rule-light);
}

.qna-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  width: 1.5rem;
}

.qna-chevron {
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--accent-blue);
  border-bottom: 2px solid var(--accent-blue);
  transform: rotate(45deg);
  transition: transform var(--transition);
  margin-bottom: 0.2rem;
}

.qna-trigger[aria-expanded="true"] .qna-chevron {
  transform: rotate(-135deg);
  margin-bottom: -0.15rem;
}

.qna-panel {
  padding: 0 1.15rem 1.1rem 3.1rem;
  background: #fff;
}

.qna-panel p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.65;
  border-left: 2px solid var(--rule);
  padding-left: 1rem;
}

/* 联络 */
.section-correspondence .correspondence-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.corp-block {
  padding: 1.25rem 1.35rem;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
}

.corp-block p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.corp-block--contact {
  background: linear-gradient(135deg, #f4f7fb 0%, #fff 100%);
}

.contact-lines {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-lines li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.75rem;
  font-size: 0.9rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule-light);
  color: var(--ink-muted);
}

.contact-lines li:last-child {
  border-bottom: none;
}

.contact-lines .label {
  color: var(--silver);
  font-size: 0.8rem;
}

/* 页脚 */
.manual-footer {
  margin-left: var(--nav-width);
  border-top: 1px solid var(--rule);
  background: linear-gradient(180deg, #eef1f6 0%, #e4e9f0 100%);
  padding: 2rem 2rem 2.25rem;
}

.footer-inner {
  max-width: 56rem;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem 2.5rem;
  align-items: start;
}

.footer-brand {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  grid-column: 1 / -1;
}

.footer-logo {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  flex-shrink: 0;
}

.footer-brand-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
}

.footer-tagline {
  margin: 0.2rem 0 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  font-size: 0.8rem;
}

.footer-nav a {
  color: var(--accent-blue);
  text-decoration: none;
}

.footer-nav a:hover {
  text-decoration: underline;
}

.footer-meta {
  grid-column: 1 / -1;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

.footer-meta p {
  margin: 0 0 0.55rem;
  font-size: 0.8rem;
  color: var(--ink-muted);
  max-width: 48rem;
}

.footer-en {
  font-size: 0.76rem !important;
  color: var(--silver) !important;
  font-style: normal;
}

.footer-legal {
  margin-top: 0.75rem !important;
}

.footer-legal a {
  color: var(--ink-muted);
}

.copyright {
  margin-top: 0.85rem !important;
  font-size: 0.75rem !important;
  color: var(--silver) !important;
}

.sep {
  margin: 0 0.35rem;
  color: var(--rule);
}

/* 滚动显现 */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 入场动画 */
.anim-fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.anim-fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-slide-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease 0.1s, transform 0.5s ease 0.1s;
}

.anim-slide-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.anim-float {
  animation: float 3s ease-in-out infinite;
}

.anim-float:nth-child(1) { animation-delay: 0s; }
.anim-float:nth-child(2) { animation-delay: 0.2s; }
.anim-float:nth-child(3) { animation-delay: 0.4s; }
.anim-float:nth-child(4) { animation-delay: 0.6s; }
.anim-float:nth-child(5) { animation-delay: 0.8s; }
.anim-float:nth-child(6) { animation-delay: 1s; }
.anim-float:nth-child(7) { animation-delay: 1.2s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* 全球用户统计 */
.section-stats {
  background: linear-gradient(135deg, #eef4fa 0%, #f0f7ff 100%);
  padding: 2.5rem 1.5rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--rule);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.stat-item {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--paper-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--rule-light);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(30, 90, 142, 0.12);
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-blue);
  display: block;
  line-height: 1.2;
}

.stat-suffix {
  font-size: 1.25rem;
  color: var(--accent-cyan);
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-top: 0.35rem;
}

/* 支持货币 */
.currency-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1rem;
}

.currency-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.currency-item:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(15, 28, 46, 0.1);
}

.currency-item img {
  width: 40px;
  height: 40px;
}

.currency-item span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink);
}

/* 安装教程 */
.install-steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.install-step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.install-step:hover {
  border-color: var(--accent-blue);
  box-shadow: 0 4px 16px rgba(30, 90, 142, 0.08);
}

.install-step-num {
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-blue);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border-radius: 50%;
}

.install-step-content p {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

/* 助记词 */
.mnemonic-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.mnemonic-block {
  padding: 1.25rem;
  background: var(--paper-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
}

.mnemonic-block p {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.mnemonic-warning {
  border-color: #e8b14a;
  background: #fffbee;
}

.mnemonic-warning p {
  color: #8b6914;
}

/* 响应式 */
@media (max-width: 1024px) {
  .entry-grid,
  .two-col,
  .capability-cards,
  .security-layout,
  .scene-card,
  .scene-card--reverse,
  .glossary-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

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

  .app-poster-track figure {
    width: min(260px, 70vw);
  }

  .cap-card--offset {
    margin-top: 0;
  }

  .scene-card--reverse img {
    order: 0;
  }

  .scene-card--reverse .scene-card-body {
    order: 0;
  }

  .glossary-item {
    border-right: none;
  }

  .glossary-item:nth-last-child(1) {
    border-bottom: none;
  }

  .glossary-item:not(:last-child) {
    border-bottom: 1px solid var(--rule-light);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-width: 0px;
  }

  .nav-toggle {
    display: flex;
  }

  .side-nav-wrap {
    width: auto;
    height: auto;
    pointer-events: none;
  }

  .side-nav-wrap .side-nav,
  .side-nav-wrap .nav-toggle {
    pointer-events: auto;
  }

  .side-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: min(88vw, 19rem);
    transform: translateX(-100%);
    transition: transform 0.28s ease;
    z-index: 930;
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.2);
  }

  .side-nav.is-open {
    transform: translateX(0);
  }

  .manual-main,
  .manual-footer {
    margin-left: 0;
  }

  .manual-article {
    padding: 4.25rem 1.15rem 0;
  }

  .manual-section {
    scroll-margin-top: 4rem;
  }

  .section-security,
  .section-glossary {
    margin-left: -1.15rem;
    margin-right: -1.15rem;
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .section-glossary {
    margin-left: 0;
    margin-right: 0;
  }

  .contact-lines li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .qna-panel {
    padding-left: 1.15rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}