/* ============================================================
   base — 基础变量、重置与全局元素
   ============================================================ */
:root {
  --color-ink: #1F2937;
  --color-text: #374151;
  --color-muted: #6B7280;
  --color-bg: #F9FAFB;
  --color-card: #FFFFFF;
  --color-border: #E5E7EB;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-accent: #2563EB;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Consolas, monospace;
  --font-sans: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-height: 64px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
}

body.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style-position: inside;
  padding-left: 0;
}

li {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.35;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

strong {
  color: var(--color-ink);
  font-weight: 600;
}

button {
  font-family: var(--font-sans);
  font-size: 1rem;
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   layout — 全站统一骨架：页头、页脚、容器、面包屑
   ============================================================ */
.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header.is-transparent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background-color: transparent;
  border-bottom-color: transparent;
}

.site-header.is-transparent.is-scrolled {
  position: fixed;
  background-color: var(--color-card);
  border-bottom-color: var(--color-border);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav li {
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
  background-color: var(--color-bg);
  text-decoration: none;
  color: var(--color-ink);
}

.site-nav a.is-current {
  background-color: var(--color-ink);
  color: var(--color-card);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-card);
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-ink);
  border-radius: 2px;
}

.site-main {
  flex: 1;
}

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.breadcrumb {
  padding: 16px 0 0;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
}

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-border);
}

.breadcrumb-current {
  color: var(--color-ink);
}

.page-header {
  padding: 20px 0 8px;
}

.page-title {
  padding: 0 0 24px;
}

.page-title h1 {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.page-title p {
  max-width: 720px;
  color: var(--color-muted);
}

.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-brand .footer-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-ink);
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 6px 0 0;
  max-width: 320px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.footer-links a:hover {
  color: var(--color-ink);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--color-muted);
  text-align: right;
}

.footer-copyright span {
  display: block;
}

/* ============================================================
   components — 通用组件：按钮、工具条、终端卡、相关链接、FAQ
   ============================================================ */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background-color: var(--color-ink);
  color: var(--color-card);
}

.btn-primary:hover {
  background-color: #111827;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--color-card);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-ink);
  text-decoration: none;
}

.toolbar {
  padding: 0 0 32px;
}

.print-btn,
.print-button {
  display: inline-block;
  padding: 8px 20px;
  font-size: 0.875rem;
  font-family: var(--font-mono);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-card);
  color: var(--color-text);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.print-btn:hover,
.print-button:hover {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading .section-code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-success);
  display: block;
  margin-bottom: 4px;
}

.section-heading h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.section-heading p {
  color: var(--color-muted);
  max-width: 720px;
}

.related-links {
  margin: 48px 0 0;
  padding: 24px 0 48px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-muted);
  display: block;
  margin-bottom: 12px;
}

.related-links-item {
  display: inline-block;
  margin-right: 24px;
  padding: 6px 0;
  font-size: 0.9375rem;
  color: var(--color-accent);
}

.text-link {
  display: inline-block;
  padding: 8px 0;
  font-weight: 600;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-card);
  margin-bottom: 12px;
}

.faq-item summary {
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-muted);
  font-weight: 400;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item .faq-answer,
.faq-item > p {
  padding: 0 20px 16px;
  color: var(--color-text);
}

.faq-item .faq-answer p {
  margin-bottom: 0.75rem;
}

.faq-item .faq-answer ul {
  padding-left: 20px;
  margin-bottom: 0.75rem;
}

.faq-item .faq-answer li {
  list-style: disc;
  margin-bottom: 4px;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-success);
  flex-shrink: 0;
}

/* ============================================================
   pages — index 首页
   ============================================================ */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  background-color: var(--color-ink);
  color: var(--color-card);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.hero-content h1 {
  font-size: 2.75rem;
  color: var(--color-card);
  margin-bottom: 16px;
  max-width: 640px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
  margin-bottom: 20px;
}

.hero-status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 32px;
}

.hero-status .status-dot {
  background-color: var(--color-success);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-actions .btn-primary {
  background-color: var(--color-card);
  color: var(--color-ink);
}

.hero-actions .btn-primary:hover {
  background-color: #E5E7EB;
}

.hero-actions .btn-secondary {
  background-color: transparent;
  color: var(--color-card);
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-actions .btn-secondary:hover {
  border-color: var(--color-card);
}

.content-media-primary {
  position: absolute;
  right: 24px;
  bottom: 24px;
  z-index: 1;
  max-width: 300px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.content-media-primary img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.content-media-primary figcaption {
  padding: 10px 14px;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  background-color: rgba(0, 0, 0, 0.4);
}

.terminal-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.terminal-card {
  background-color: var(--color-ink);
  border-radius: var(--radius-lg);
  color: #D1D5DB;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  overflow: hidden;
}

.terminal-header {
  padding: 12px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.terminal-prompt {
  color: var(--color-success);
}

.terminal-body {
  padding: 20px;
}

.terminal-line {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.terminal-line:last-child {
  border-bottom: none;
}

.terminal-label {
  min-width: 120px;
  color: #9CA3AF;
}

.terminal-value {
  flex: 1;
  color: #E5E7EB;
}

.terminal-status {
  color: var(--color-success);
  white-space: nowrap;
}

.terminal-footer {
  padding: 12px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #6B7280;
  font-size: 0.8125rem;
}

.services-index,
.process-preview,
.news-preview,
.faq-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.section-header h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.section-header p {
  color: var(--color-muted);
  max-width: 720px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.service-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.service-icon {
  width: 40px;
  height: 40px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-ink);
}

.service-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.service-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.service-item a {
  font-size: 0.875rem;
  font-weight: 600;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-success);
  display: block;
  margin-bottom: 12px;
  font-weight: 700;
}

.step-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.step-item a {
  font-size: 0.875rem;
  font-weight: 600;
}

.news-list {
  margin-top: 24px;
}

.news-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin-bottom: 12px;
}

.news-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.news-version {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-ink);
}

.news-tag {
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 999px;
  background-color: var(--color-bg);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.news-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.news-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.section-footer {
  margin-top: 24px;
}

.section-footer a {
  font-weight: 600;
}

.faq-preview .faq-item {
  margin-bottom: 12px;
}

/* ============================================================
   pages — services 服务范围
   ============================================================ */
.page-services .scope-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 0 0 48px;
}

.scope-text h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.scope-text p {
  color: var(--color-muted);
  margin-bottom: 12px;
}

.scope-figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-card);
}

.scope-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.scope-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.page-services .services-grid {
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 0;
  padding: 0 0 48px;
}

.services-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 16px;
}

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  min-width: 0;
}

.service-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.service-card .service-content {
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.service-card dl {
  margin: 0;
}

.service-card dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 12px;
  margin-bottom: 4px;
}

.service-card dd {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-width: 0;
}

.boundary {
  padding: 0 0 48px;
}

.boundary h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.boundary-terminal {
  background-color: var(--color-ink);
  border-radius: var(--radius-md);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: #D1D5DB;
  margin-bottom: 16px;
}

.boundary-terminal .terminal-line {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-danger);
  margin-bottom: 12px;
  border-bottom: none;
  padding: 0;
}

.boundary-terminal .status-dot {
  background-color: var(--color-danger);
}

.boundary-terminal ul {
  padding-left: 20px;
}

.boundary-terminal li {
  list-style: square;
  padding: 4px 0;
  color: #E5E7EB;
}

.boundary > p {
  color: var(--color-muted);
  max-width: 720px;
}

.material-type {
  padding: 0 0 48px;
}

.material-type h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.material-type > p {
  color: var(--color-muted);
  margin-bottom: 20px;
}

.material-type ul {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 16px;
}

.material-type li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 0.875rem;
  color: var(--color-text);
}

.material-type li strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.material-type > p:last-child {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* ============================================================
   pages — process 合作流程
   ============================================================ */
.goal-section {
  padding: 0 0 48px;
}

.goal-section .section-heading {
  margin-bottom: 16px;
}

.goal-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.goal-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 0.9375rem;
  position: relative;
  padding-left: 48px;
}

.goal-list li::before {
  content: '✓';
  position: absolute;
  left: 20px;
  top: 20px;
  color: var(--color-success);
  font-weight: 700;
}

.process-figure {
  margin: 0 0 48px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.process-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.process-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-card);
}

.prerequisites-section,
.steps-section,
.timeline-section,
.acceptance-section,
.faq-entry {
  padding: 0 0 48px;
}

.prerequisites-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.prerequisites-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.prerequisites-list .item-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-ink);
}

.prerequisites-list .item-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.steps-section .step-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.step-header .step-number {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-card);
  background-color: var(--color-ink);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin: 0;
}

.step-header h3 {
  font-size: 1.0625rem;
  margin: 0;
}

.step-task {
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-output {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.timeline-list {
  position: relative;
  padding-left: 0;
  margin-top: 20px;
}

.timeline-list li {
  position: relative;
  padding: 0 0 24px 32px;
  border-left: 2px solid var(--color-border);
  margin-left: 8px;
}

.timeline-list li:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.timeline-list li::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-success);
  border: 2px solid var(--color-card);
}

.timeline-label {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.acceptance-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.acceptance-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.check-label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-success);
  flex-shrink: 0;
}

.check-desc {
  font-size: 0.875rem;
  color: var(--color-text);
}

.faq-entry .text-link {
  font-size: 0.9375rem;
}

/* ============================================================
   pages — about 公开信息
   ============================================================ */
.positioning {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 0 0 48px;
}

.positioning-text h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.positioning-text p {
  color: var(--color-text);
  margin-bottom: 12px;
}

.positioning-figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.positioning-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.positioning-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-card);
}

.principles {
  padding: 0 0 48px;
}

.principles h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.principle-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.principle-mark {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-success);
  font-size: 1.125rem;
  flex-shrink: 0;
  line-height: 1.5;
}

.principle-body h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.principle-body p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.boundaries {
  padding: 0 0 48px;
}

.boundaries h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.boundary-col {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.boundary-col h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.boundary-col li {
  padding: 6px 0;
  font-size: 0.875rem;
  color: var(--color-text);
  position: relative;
  padding-left: 20px;
}

.boundary-col li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-muted);
}

.update-mechanism {
  padding: 0 0 48px;
}

.update-mechanism h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.update-mechanism p {
  color: var(--color-text);
  max-width: 720px;
}

.contact-entry {
  padding: 0 0 48px;
}

.contact-entry h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.contact-entry p {
  color: var(--color-text);
}

.contact-entry a {
  font-weight: 600;
}

/* ============================================================
   pages — faq 常见问题
   ============================================================ */
.faq-list {
  max-width: 900px;
}

.faq-intro {
  margin-bottom: 24px;
}

.faq-intro h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.faq-intro p {
  color: var(--color-muted);
}

.faq-items .faq-item {
  margin-bottom: 12px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer a {
  font-weight: 600;
}

.faq-visual {
  margin: 32px 0 0;
}

.faq-figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.faq-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-card);
}

.more-entry {
  padding: 48px 0 0;
}

.more-entry h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.more-entry > p {
  color: var(--color-muted);
  margin-bottom: 20px;
}

.entry-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.entry-link {
  display: inline-block;
  padding: 12px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-card);
  color: var(--color-ink);
  font-weight: 600;
  font-size: 0.9375rem;
}

.entry-link:hover {
  border-color: var(--color-ink);
  text-decoration: none;
}

/* ============================================================
   pages — news 服务动态
   ============================================================ */
.content-media-inline {
  margin: 0 0 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.content-media-inline img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-card);
}

.version-list {
  padding: 0 0 48px;
}

.version-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
}

.version-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.version-number {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-ink);
}

.version-type {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 999px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

.version-content h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.version-content p {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: 8px;
}

.version-content .impact {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 0;
}

.version-content .impact strong {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink);
  margin-right: 8px;
}

.version-rule {
  padding: 0 0 48px;
}

.version-rule .rule-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.rule-card p {
  font-size: 0.9375rem;
  color: var(--color-text);
}

.rule-card li {
  padding: 6px 0;
  font-size: 0.875rem;
  color: var(--color-text);
  padding-left: 20px;
  position: relative;
}

.rule-card li::before {
  content: '›';
  position: absolute;
  left: 4px;
  color: var(--color-muted);
}

.rule-card li strong {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  margin-right: 8px;
}

.related-entry {
  padding: 0 0 48px;
}

.related-entry h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.related-entry .related-links {
  margin: 0;
  padding: 0;
  border: none;
}

.related-entry .related-links a {
  display: inline-block;
  margin-right: 24px;
  padding: 6px 0;
  font-weight: 600;
}

/* ============================================================
   pages — contact 联系目录
   ============================================================ */
.scene-figure {
  margin: 0 0 48px;
}

.contact-figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.contact-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.contact-figure figcaption {
  padding: 10px 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-card);
}

.categories {
  padding: 0 0 48px;
}

.categories h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.categories > p {
  color: var(--color-muted);
  margin-bottom: 24px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.category-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.category-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.category-card p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.prep-list {
  padding: 0 0 48px;
}

.prep-list h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.prep-list > p {
  color: var(--color-muted);
  margin-bottom: 20px;
}

.prep-items {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.prep-items li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 0.875rem;
  color: var(--color-text);
}

.prep-items li strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.feedback {
  padding: 0 0 48px;
}

.feedback h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.feedback p {
  color: var(--color-text);
  max-width: 720px;
  margin-bottom: 8px;
}

/* ============================================================
   pages — 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  margin-bottom: 24px;
}

.error-link {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-ink);
  color: var(--color-card);
  border-radius: var(--radius-md);
  font-weight: 600;
}

.error-link:hover {
  background-color: #111827;
  text-decoration: none;
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .services-list {
    grid-template-columns: 1fr;
  }

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

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

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

  .goal-list {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

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

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

  .version-item {
    grid-template-columns: 120px 1fr;
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    display: none;
    padding: 8px 16px 16px;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav a {
    padding: 14px 12px;
    font-size: 1rem;
  }

  .site-nav a.is-current {
    background-color: var(--color-bg);
    color: var(--color-ink);
  }

  .hero {
    min-height: 480px;
  }

  .hero-content {
    padding: 64px 16px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.0625rem;
  }

  .content-media-primary {
    position: static;
    max-width: 100%;
    margin: 0 16px 16px;
  }

  .content-media-primary img {
    height: 180px;
  }

  .terminal-summary,
  .services-index,
  .process-preview,
  .news-preview,
  .faq-preview {
    padding: 32px 16px;
  }

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

  .process-steps {
    grid-template-columns: 1fr;
  }

  .inner-main {
    padding: 0 16px;
  }

  .scope-overview,
  .positioning {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .services-list {
    grid-template-columns: 1fr;
  }

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

  .prep-items {
    grid-template-columns: 1fr;
  }

  .material-type ul {
    grid-template-columns: 1fr;
  }

  .goal-list {
    grid-template-columns: 1fr;
  }

  .prerequisites-list {
    grid-template-columns: 1fr;
  }

  .acceptance-list {
    grid-template-columns: 1fr;
  }

  .principle-list {
    grid-template-columns: 1fr;
  }

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

  .version-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .version-meta {
    flex-direction: row;
    align-items: center;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    padding: 24px 16px;
  }

  .footer-copyright {
    text-align: left;
  }

  .footer-links {
    flex-wrap: wrap;
  }

  .page-header h1,
  .page-title h1 {
    font-size: 1.625rem;
  }

  .terminal-line {
    flex-wrap: wrap;
    gap: 6px;
  }

  .terminal-label {
    min-width: 100px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    text-align: center;
  }

  .boundary-terminal {
    padding: 16px;
  }

  .step-card {
    padding: 20px;
  }

  .service-card {
    padding: 20px;
  }

  .timeline-list li {
    padding-left: 24px;
  }

  .faq-item summary {
    padding: 14px 40px 14px 16px;
  }

  .faq-item .faq-answer,
  .faq-item > p {
    padding: 0 16px 14px;
  }
}

@media (max-width: 480px) {
  .brand-tag {
    display: none;
  }

  .hero-content h1 {
    font-size: 1.625rem;
  }

  .page-title h1 {
    font-size: 1.5rem;
  }

  .section-header h2,
  .section-heading h2,
  .scope-text h2,
  .positioning-text h2,
  .principles h2,
  .boundaries h2,
  .update-mechanism h2,
  .contact-entry h2,
  .categories h2,
  .prep-list h2,
  .feedback h2,
  .related-entry h2,
  .more-entry h2,
  .faq-intro h2,
  .material-type h2,
  .boundary h2,
  .goal-section h2,
  .prerequisites-section h2,
  .steps-section h2,
  .timeline-section h2,
  .acceptance-section h2,
  .faq-entry h2 {
    font-size: 1.25rem;
  }

  .terminal-line {
    flex-direction: column;
  }

  .terminal-status {
    white-space: normal;
  }

  .entry-links {
    flex-direction: column;
  }

  .entry-link {
    text-align: center;
  }

  .related-links-item {
    display: block;
    margin: 0 0 8px;
  }
}

/* ============================================================
   print — 打印样式
   ============================================================ */
@media print {
  .site-header,
  .site-footer,
  .breadcrumb,
  .toolbar,
  .nav-toggle,
  .related-links,
  .faq-entry,
  .more-entry,
  .contact-entry,
  .related-entry {
    display: none !important;
  }

  body {
    background-color: #FFFFFF;
    color: #000000;
    font-size: 12pt;
  }

  .inner-main {
    max-width: 100%;
    padding: 0;
  }

  .page-header h1 {
    font-size: 18pt;
  }

  h2 {
    font-size: 14pt;
  }

  h3 {
    font-size: 12pt;
  }

  .service-card,
  .step-card,
  .version-item,
  .boundary-col,
  .principle-list li,
  .prerequisites-list li,
  .acceptance-list li,
  .goal-list li,
  .category-card,
  .prep-items li,
  .material-type li {
    border: 1px solid #CCCCCC;
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .boundary-terminal,
  .terminal-card {
    background-color: #FFFFFF;
    color: #000000;
    border: 1px solid #CCCCCC;
  }

  .boundary-terminal .terminal-line,
  .boundary-terminal li,
  .terminal-label,
  .terminal-value,
  .terminal-status,
  .terminal-note {
    color: #000000;
  }

  .status-dot {
    border: 1px solid #000000;
  }

  a {
    color: #000000;
    text-decoration: none;
  }

  img {
    max-width: 100%;
  }

  .scope-figure img,
  .positioning-figure img,
  .process-figure img,
  .contact-figure img,
  .faq-figure img,
  .content-media-inline img {
    height: auto;
    max-height: 240px;
  }
}