/* ==========================================================================
   悠兔 Youtu (youtu6.buzz) - Blue Manual 蓝图式极简科技样式系统
   设计理念：规范、严谨、清晰的技术说明书风格。
   无大面积圆角、无假数据、无冗余动画。
   ========================================================================== */

:root {
  --bg-page: #F7F9FC;
  --bg-content: #FFFFFF;
  --color-brand-blue: #2458E7;
  --color-heading: #15223C;
  --color-body: #2B384E;
  --color-secondary: #66738A;
  --color-light-blue: #EAF0FE;
  --color-border: #E2E7EF;
  --color-border-dark: #C6D1E3;
  --color-code-bg: #F0F4FA;
  --color-tag-bg: #EDF3FC;
  --color-alert-warn: #FFF8E6;
  --color-alert-border: #F5C050;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --max-w-site: 1080px;
  --max-w-article: 760px;
  --transition-fast: 0.15s ease;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-page);
  color: var(--color-body);
  font-family: var(--font-sans);
  line-height: 1.65;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-brand-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #173eb5;
  text-decoration: underline;
}

/* 布局容器 */
.manual-container {
  max-width: var(--max-w-site);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.article-container {
  max-width: var(--max-w-article);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 蓝图网格微底纹与几何标尺装饰 */
.blueprint-rule {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
  width: 100%;
}

/* 顶部顶栏 */
.site-header {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-anchor {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-heading);
  text-decoration: none;
}

.brand-anchor:hover {
  text-decoration: none;
}

.brand-logo-frame {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  overflow: hidden;
  background-color: #15223C;
  border: 1px solid #2458E7;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-logo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-naming {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-naming-main {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.02em;
}

.brand-naming-sub {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-nav a {
  font-size: 0.88rem;
  color: var(--color-secondary);
  font-weight: 500;
  text-decoration: none;
}

.header-nav a:hover {
  color: var(--color-brand-blue);
  text-decoration: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
  border-color: var(--color-brand-blue);
}

.btn-primary:hover {
  background-color: #173eb5;
  border-color: #173eb5;
  color: #FFFFFF;
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-heading);
  border-color: var(--color-border-dark);
}

.btn-outline:hover {
  border-color: var(--color-brand-blue);
  color: var(--color-brand-blue);
  background-color: var(--color-light-blue);
  text-decoration: none;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
}

/* 首屏 Hero 区 */
.hero-section {
  padding: 60px 0 48px;
  background-color: var(--bg-content);
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 40px;
  align-items: center;
}

.hero-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  background-color: var(--color-light-blue);
  color: var(--color-brand-blue);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 16px;
  border-radius: 2px;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--color-brand-blue);
  font-weight: 600;
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 1.02rem;
  color: var(--color-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 580px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
}

/* 首屏右侧蓝图几何视觉 */
.hero-blueprint-panel {
  background-color: #15223C;
  border: 1px solid #2458E7;
  padding: 24px;
  border-radius: 2px;
  position: relative;
  overflow: hidden;
  color: #FFFFFF;
}

.blueprint-grid-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(rgba(36, 88, 231, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 88, 231, 0.15) 1px, transparent 1px);
  background-size: 20px 20px;
  pointer-events: none;
}

.blueprint-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  padding-bottom: 12px;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}

.blueprint-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #8CA7F8;
  letter-spacing: 0.08em;
}

.blueprint-core {
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  z-index: 1;
  margin-bottom: 20px;
}

.blueprint-logo-box {
  width: 60px;
  height: 60px;
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid #2458E7;
  background: #0B1324;
  flex-shrink: 0;
}

.blueprint-logo-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blueprint-specs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  color: #D2DEFA;
}

.blueprint-specs span {
  color: #8CA7F8;
}

.blueprint-spec-rows {
  border-top: 1px dashed rgba(255, 255, 255, 0.15);
  padding-top: 14px;
  position: relative;
  z-index: 1;
  font-size: 0.78rem;
  color: #A9BCE6;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.blueprint-stat-item strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
}

/* 栏目通用结构 */
.section-wrap {
  padding: 56px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-wrap.bg-white {
  background-color: var(--bg-content);
}

.section-header-block {
  margin-bottom: 32px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--color-brand-blue);
  margin-bottom: 6px;
  display: block;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 0.96rem;
  color: var(--color-secondary);
  max-width: 680px;
  line-height: 1.6;
}

/* 01 品牌介绍条目 */
.blueprint-intro-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.intro-item {
  border-left: 2px solid var(--color-brand-blue);
  padding-left: 16px;
}

.intro-item h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.intro-item p {
  font-size: 0.9rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

/* 02 服务资料区（横线式排版） */
.manual-spec-list {
  border-top: 1px solid var(--color-border);
}

.manual-spec-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: flex-start;
  gap: 20px;
}

.spec-label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: 8px;
}

.spec-label-idx {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--color-brand-blue);
}

.spec-content {
  font-size: 0.92rem;
  color: var(--color-body);
  line-height: 1.7;
}

.spec-note {
  font-size: 0.82rem;
  color: var(--color-secondary);
  margin-top: 4px;
}

/* 03 套餐对照表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  background-color: var(--bg-content);
}

.manual-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.manual-table th {
  background-color: #F1F4FA;
  color: var(--color-heading);
  font-weight: 700;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.manual-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.5;
}

.manual-table tr:last-child td {
  border-bottom: none;
}

.price-text {
  font-weight: 700;
  color: var(--color-brand-blue);
  white-space: nowrap;
}

.price-anomaly {
  color: #C81E1E !important;
}

.price-sub-row {
  margin-top: 4px;
}

.badge-status {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 2px;
  font-family: var(--font-mono);
}

.badge-pending {
  background-color: #FFF3D6;
  color: #946200;
  border: 1px solid #FFE08A;
}

.badge-warn {
  background-color: #FDE8E8;
  color: #C81E1E;
  border: 1px solid #F8B4B4;
}

.badge-thirdparty {
  background-color: #EDF2F7;
  color: #4A5568;
  border: 1px solid #CBD5E0;
}

/* 订购链接专属图标与按钮 (Blue Manual 蓝图规范) */
.table-order-action {
  margin-top: 28px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.order-link-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px 44px;
  background-color: var(--color-brand-blue);
  color: #FFFFFF;
  font-size: 1.08rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid var(--color-brand-blue);
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(36, 88, 231, 0.22);
  transition: all var(--transition-fast);
  letter-spacing: 0.03em;
}

.order-link-icon-btn:hover {
  background-color: #173eb5;
  border-color: #173eb5;
  color: #FFFFFF;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(36, 88, 231, 0.35);
  transform: translateY(-2px);
}

.order-link-icon-btn svg.order-icon-svg {
  width: 20px;
  height: 20px;
  stroke: #FFFFFF;
  flex-shrink: 0;
}

.order-link-icon-btn svg.order-arrow-svg {
  width: 18px;
  height: 18px;
  stroke: #FFFFFF;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.order-link-icon-btn:hover svg.order-arrow-svg {
  transform: translateX(4px);
}

@media (max-width: 640px) {
  .order-link-icon-btn {
    width: 100%;
    padding: 12px 20px;
    font-size: 1rem;
  }
}

/* 04 使用前需要了解的事项（两列对照排版） */
.notices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.notice-card {
  background-color: var(--bg-content);
  border: 1px solid var(--color-border);
  padding: 22px;
  position: relative;
}

.notice-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
}

.notice-card-idx {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-brand-blue);
  font-size: 0.85rem;
}

.notice-card-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-heading);
}

.notice-card-body {
  font-size: 0.88rem;
  color: var(--color-secondary);
  line-height: 1.65;
}

/* 05 六篇知识指南（有编号的横线列表） */
.articles-line-list {
  border-top: 1px solid var(--color-border);
}

.article-line-item {
  display: grid;
  grid-template-columns: 60px 1.2fr 2fr 80px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  gap: 20px;
  text-decoration: none;
  color: inherit;
  transition: background-color var(--transition-fast);
}

.article-line-item:hover {
  background-color: rgba(36, 88, 231, 0.03);
  text-decoration: none;
}

.article-line-num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-brand-blue);
}

.article-line-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.4;
}

.article-line-item:hover .article-line-title {
  color: var(--color-brand-blue);
}

.article-line-desc {
  font-size: 0.88rem;
  color: var(--color-secondary);
  line-height: 1.6;
}

.article-line-arrow {
  text-align: right;
  font-size: 1.2rem;
  color: var(--color-brand-blue);
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.article-line-item:hover .article-line-arrow {
  transform: translateX(4px);
}

/* 06 常见问题 FAQ */
.faq-list {
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
}

.faq-q {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.faq-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-brand-blue);
  font-weight: 800;
  flex-shrink: 0;
}

.faq-a {
  font-size: 0.92rem;
  color: var(--color-secondary);
  line-height: 1.7;
  padding-left: 28px;
}

/* 07 关于与联系 & 页脚 */
.site-footer {
  background-color: #FFFFFF;
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
  font-size: 0.86rem;
  color: var(--color-secondary);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-col h4 {
  font-size: 0.96rem;
  color: var(--color-heading);
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-col p {
  line-height: 1.65;
  margin-bottom: 8px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--color-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-brand-blue);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
}

/* ==========================================================================
   文章详情页专有排版
   ========================================================================== */
.article-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--bg-content);
}

.article-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-secondary);
  margin-bottom: 16px;
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.article-category {
  display: inline-block;
  padding: 2px 8px;
  background-color: var(--color-light-blue);
  color: var(--color-brand-blue);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
  border-radius: 2px;
  font-family: var(--font-mono);
}

.article-h1 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.015em;
}

.article-meta-bar {
  display: flex;
  gap: 20px;
  font-size: 0.84rem;
  color: var(--color-secondary);
  font-family: var(--font-mono);
  margin-bottom: 20px;
}

.article-summary-box {
  background-color: var(--bg-page);
  border-left: 3px solid var(--color-brand-blue);
  padding: 16px 20px;
  font-size: 0.94rem;
  color: var(--color-body);
  line-height: 1.7;
}

.article-toc {
  background-color: var(--bg-content);
  border: 1px solid var(--color-border);
  padding: 20px;
  margin: 32px 0 40px;
}

.article-toc-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.article-toc ol {
  padding-left: 20px;
  font-size: 0.9rem;
  line-height: 1.8;
}

.article-toc a {
  color: var(--color-secondary);
}

.article-toc a:hover {
  color: var(--color-brand-blue);
}

/* 文章正文样式 */
.article-body {
  padding: 36px 0 60px;
  line-height: 1.85;
  font-size: 1.02rem;
  color: #1F2A38;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.article-body h2::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-brand-blue);
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body strong {
  color: var(--color-heading);
  font-weight: 700;
}

.article-callout {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-brand-blue);
  padding: 18px 22px;
  margin: 24px 0;
  font-size: 0.94rem;
  line-height: 1.7;
}

.article-callout.callout-warn {
  border-left-color: #E09000;
  background-color: #FFFDF9;
}

.article-checklist {
  list-style: none;
  margin: 20px 0;
  padding: 0;
  border: 1px solid var(--color-border);
  background: #FFFFFF;
}

.article-checklist li {
  padding: 12px 18px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 0;
  font-size: 0.92rem;
}

.article-checklist li:last-child {
  border-bottom: none;
}

.article-checklist .chk-box {
  color: var(--color-brand-blue);
  font-family: var(--font-mono);
  font-weight: 700;
}

.article-table-wrap {
  margin: 28px 0;
  border: 1px solid var(--color-border);
  background: #FFFFFF;
  overflow-x: auto;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.article-table th {
  background-color: #F1F4FA;
  color: var(--color-heading);
  padding: 12px 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-faq-section {
  margin-top: 48px;
  border-top: 2px solid var(--color-heading);
  padding-top: 28px;
}

.article-faq-section h3 {
  font-size: 1.3rem;
  margin-bottom: 20px;
}

.article-related-box {
  margin-top: 48px;
  padding: 24px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
}

.article-related-box h4 {
  font-size: 1.05rem;
  color: var(--color-heading);
  margin-bottom: 14px;
}

.article-related-list {
  list-style: none;
}

.article-related-list li {
  margin-bottom: 10px;
}

.article-related-list a {
  font-size: 0.94rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* 模态弹窗（入口待配置） */
.config-modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.config-modal-backdrop.is-active {
  display: flex;
}

.config-modal-card {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  max-width: 460px;
  width: 100%;
  padding: 28px;
  border-radius: 2px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.12);
  position: relative;
}

.modal-header-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-brand-blue);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 12px;
}

.modal-message {
  font-size: 0.92rem;
  color: var(--color-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* ==========================================================================
   响应式断点控制
   ========================================================================== */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .blueprint-intro-strip {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .notices-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  
  .article-line-item {
    grid-template-columns: 44px 1fr 32px;
    gap: 12px;
  }
  
  .article-line-desc {
    display: none; /* 移动端隐藏大段简介，保留编号/标题/箭头以保持紧凑极简 */
  }
}

@media (max-width: 640px) {
  .header-nav {
    display: none; /* 移动端精简导航 */
  }

  .manual-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-inner {
    height: 56px;
  }

  .brand-naming-sub {
    display: none; /* 极简移动端只保留主标题 */
  }

  .header-actions .btn-sm {
    padding: 5px 10px;
    font-size: 0.78rem;
  }
  
  .hero-title {
    font-size: 1.85rem;
  }
  
  .manual-spec-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 0;
  }
  
  .article-h1 {
    font-size: 1.55rem;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }

  .header-actions .btn {
    width: auto;
  }
}

/* 辅助无障碍与无动画偏好支持 (Bing Page Experience & Accessibility) */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}