/* ==========================================================================
   吃瓜最新 gqsryw.cn — 整站样式表
   视觉方向：摄影档案风 · 暖灰画布 · 档案印章红强调
   ========================================================================== */

/* --------------------------------------------------------------------------
   01 · Base — 基础变量、重置、字体、色彩
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #f5f2ec;
  --color-text: #1f1f1f;
  --color-text-secondary: #55514c;
  --color-accent: #b3541e;
  --color-accent-dark: #93431a;
  --color-card: #ffffff;
  --color-border: #d9d3c8;
  --color-header-bg: #262626;
  --color-header-text: #f0ede6;
  --color-meta: #8a8378;

  --font-serif: Georgia, 'Times New Roman', 'STSong', 'SimSun', serif;
  --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  --container-width: 1200px;
  --container-pad: 24px;
  --radius-sm: 4px;
  --radius: 8px;
  --space-sm: 16px;
  --space-md: 32px;
  --space-lg: 56px;
  --space-xl: 88px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

strong {
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   02 · Layout — 全站统一容器与骨架
   -------------------------------------------------------------------------- */

/* 统一容器 */
.header-inner,
.footer-inner,
.hero,
.dual-path-inner,
.section-heading,
.service-grid,
.steps-row,
.steps-footer,
.insight-grid,
.faq-list,
.faq-footer,
.cta-inner,
.breadcrumb-inner,
.page-layout,
.layout-shell,
.flow-note-inner,
.title-inner,
.guide-content,
.sidebar-inner,
.positioning-block,
.principles-grid,
.commitment-inner,
.aside-inner {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* --------------------------------------------------------------------------
   03 · Header — 全站统一页头与导航
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--color-header-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 24px;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-header-text);
  letter-spacing: 0.04em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand:hover {
  color: #fff;
  text-decoration: none;
}

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

.site-nav li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.925rem;
  color: var(--color-header-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav li a:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.site-nav li a.is-current {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.14);
  font-weight: 600;
}

/* 汉堡按钮 — 桌面隐藏，手机显示 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-header-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

/* --------------------------------------------------------------------------
   04 · Breadcrumb — 全站统一面包屑
   -------------------------------------------------------------------------- */

.breadcrumb {
  background-color: transparent;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.breadcrumb ol li {
  display: flex;
  align-items: center;
  gap: 6px;
}

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

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

.breadcrumb-current,
.breadcrumb .separator,
.breadcrumb .breadcrumb-sep {
  color: var(--color-text-secondary);
}

.breadcrumb-sep {
  margin: 0 2px;
}

/* 第二种面包屑结构（内页主内容区） */
.inner-main .breadcrumb {
  border-bottom: none;
  padding: 20px 0 0;
}

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

/* --------------------------------------------------------------------------
   05 · Buttons — 全站按钮
   -------------------------------------------------------------------------- */

.btn,
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  border: 1px solid transparent;
  text-align: center;
  line-height: 1.4;
}

.btn,
.btn-primary {
  background-color: var(--color-accent);
  color: #fff;
}

.btn:hover,
.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   06 · Components — 通用卡片、折叠、列表等
   -------------------------------------------------------------------------- */

/* 页面标题区 — 全站内页统一 */
.page-header {
  padding: 40px 0 8px;
}

.page-title {
  font-size: 2rem;
  line-height: 1.25;
  color: var(--color-text);
}

.page-heading,
.page-title-area {
  padding: 16px 0 24px;
}

.page-intro,
.page-lead,
.lead {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.8;
}

.meta-label,
.meta-number,
.page-code,
.page-meta,
.page-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

/* 区块标题 */
.section-title,
.section-heading h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.section-heading {
  text-align: left;
  margin-bottom: var(--space-md);
}

.section-heading p {
  color: var(--color-text-secondary);
  max-width: 640px;
}

.section-desc,
.section-intro {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  max-width: 720px;
}

/* 相关链接 — 全站统一底部导航 */
.related-links {
  margin-top: var(--space-lg);
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-meta);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 8px;
}

.related-links-item {
  font-size: 0.9rem;
}

/* FAQ 折叠 — 原生 details */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item,
.faq-group .faq-list details {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item summary,
.faq-group .faq-list summary {
  padding: 18px 24px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after,
.faq-group .faq-list summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-family: var(--font-sans);
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after,
.faq-group .faq-list details[open] summary::after {
  content: "−";
}

.faq-item summary:hover,
.faq-group .faq-list summary:hover {
  background-color: #faf8f4;
}

.faq-item p,
.faq-group .faq-list details p {
  padding: 0 24px 20px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* 图片容器统一约束 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

figcaption {
  font-size: 0.8rem;
  color: var(--color-meta);
  padding-top: 8px;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

/* --------------------------------------------------------------------------
   07 · Pages — 首页
   -------------------------------------------------------------------------- */

/* 首屏 Hero */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

.hero-text h1 {
  font-size: 2.5rem;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-slogan {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--color-accent);
  margin-bottom: 12px;
  font-style: italic;
}

.hero-desc {
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 520px;
}

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

.hero-figure {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.hero-figure img {
  border: none;
  border-radius: 0;
  aspect-ratio: 4 / 3;
}

.hero-figure figcaption {
  padding: 12px 16px;
  background-color: var(--color-card);
}

/* 双路径导航 */
.dual-path {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.dual-path-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.path-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  background-color: var(--color-bg);
  position: relative;
}

.path-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-meta);
  display: block;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.path-card h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.path-card p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.path-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.path-card ul a {
  font-weight: 500;
}

/* 服务目录 */
.service-directory {
  padding: var(--space-xl) 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.card-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
  border-radius: 0;
}

.card-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-meta);
  padding: 16px 20px 0;
  letter-spacing: 0.06em;
}

.service-card h3 {
  font-size: 1.2rem;
  padding: 8px 20px 0;
}

.service-card > p {
  color: var(--color-text-secondary);
  font-size: 0.925rem;
  padding: 8px 20px;
  flex-grow: 1;
}

.service-card > a {
  margin: 0 20px 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* 自助步骤 */
.prep-steps {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.step-item {
  padding: 24px;
  border-left: 2px solid var(--color-accent);
  background-color: var(--color-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.step-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.step-item p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

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

/* 行业洞察摘要 */
.insight-summary {
  padding: var(--space-xl) 0;
}

.insight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.insight-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.insight-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.insight-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.insight-card p {
  color: var(--color-text-secondary);
  font-size: 0.925rem;
  margin-bottom: 12px;
  line-height: 1.75;
}

.insight-card a {
  font-weight: 600;
  font-size: 0.9rem;
}

/* FAQ 摘要 */
.faq-preview {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

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

/* 合作入口横幅 */
.cta-banner {
  padding: var(--space-xl) 0;
}

.cta-inner {
  background-color: var(--color-header-bg);
  border-radius: var(--radius);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-inner p {
  color: var(--color-header-text);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  max-width: 560px;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   08 · Pages — 内页通用与右侧栏布局
   -------------------------------------------------------------------------- */

/* 内页主容器 */
.inner-main {
  padding-bottom: var(--space-lg);
}

/* 右侧栏布局 — 主内容在前，aside 在后 */
.page-layout,
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  align-items: start;
  padding-top: 0;
  padding-bottom: var(--space-lg);
}

.page-aside,
.sidebar,
.related-links.aside {
  position: sticky;
  top: 88px;
}

.aside-block,
.sidebar-inner,
.aside-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.aside-block h2,
.sidebar-inner h2,
.aside-inner h2 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.aside-links,
.prep-list,
.aside-inner ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.aside-links a,
.aside-inner ul a {
  color: var(--color-text);
  font-size: 0.925rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.aside-links a:hover,
.aside-inner ul a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.aside-note p,
.sidebar-note,
.sidebar-tip {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   09 · Pages — 服务内容页（fuwu）
   -------------------------------------------------------------------------- */

.service-list {
  margin-top: 8px;
}

.service-item {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

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

.service-media {
  border-radius: var(--radius);
  overflow: hidden;
}

.service-media img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-border);
}

.service-body {
  min-width: 0;
}

.service-no {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 8px;
}

.service-body h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.service-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 16px;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.service-body p:not(.service-label) {
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 8px;
}

.service-body > a {
  display: inline-block;
  margin-top: 12px;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   10 · Pages — 方法体系页（fangfa）
   -------------------------------------------------------------------------- */

.method-steps {
  padding: 24px 0 var(--space-lg);
}

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

.step-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.step-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

.step-card .key-question {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-meta);
  font-style: italic;
}

/* 脉络规则区 */
.timeline-rules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  align-items: start;
}

.rules-text h2 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.rules-text p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.rules-text ul {
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.rules-text ul li {
  padding-left: 20px;
  position: relative;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.rules-text ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.rules-text ul strong {
  color: var(--color-text);
}

.rules-figure {
  border-radius: var(--radius);
  overflow: hidden;
}

.rules-figure img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   11 · Pages — 行业洞察页（dongcha）
   -------------------------------------------------------------------------- */

.insight-list {
  padding: 24px 0 var(--space-lg);
}

.insight-list .insight-grid {
  gap: 24px;
}

.insight-list .insight-card {
  padding: 24px;
}

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

.card-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  flex-shrink: 0;
}

.card-header h3 {
  font-size: 1.15rem;
  margin: 0;
}

.insight-card > p {
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.insight-card > a {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-block;
  margin-top: 8px;
}

/* 阅读指引 */
.reading-guide {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.reading-guide .guide-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.guide-content h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.guide-content p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  max-width: 520px;
}

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

.guide-media img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   12 · Pages — 合作流程页（liucheng）
   -------------------------------------------------------------------------- */

.content-media-inline {
  margin: 24px 0 32px;
}

.content-media-inline img {
  aspect-ratio: 16 / 6;
  border: 1px solid var(--color-border);
}

.flow-section {
  padding: 16px 0 32px;
}

.flow-list {
  display: flex;
  flex-direction: column;
  counter-reset: flow-counter;
}

.flow-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.flow-step {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  color: var(--color-accent);
  line-height: 1.3;
  border-left: 2px solid var(--color-accent);
  padding-left: 16px;
}

.flow-content h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.flow-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 12px;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.flow-content p:not(.flow-label) {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 侧栏准备清单 */
.sidebar-inner {
  position: sticky;
  top: 88px;
}

.prep-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  position: relative;
  padding-left: 24px;
}

.prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.prep-list li:last-child {
  border-bottom: none;
}

.sidebar-tip {
  margin-top: 16px;
  padding: 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.sidebar-link {
  display: inline-block;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* 流程底部横幅 */
.flow-note {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
}

.flow-note-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.flow-note-inner p {
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

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

/* --------------------------------------------------------------------------
   13 · Pages — 常见问题页（changjian）
   -------------------------------------------------------------------------- */

.faq-group {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.faq-group:last-of-type {
  border-bottom: none;
}

.faq-group h2 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.faq-group .faq-list {
  gap: 12px;
}

/* 标题区双栏 */
.title-text {
  max-width: 720px;
}

.title-figure {
  max-width: 360px;
}

.title-figure img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-border);
}

/* FAQ 引导区 */
.faq-guide {
  margin-top: 32px;
  padding: 28px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.faq-guide p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

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

/* --------------------------------------------------------------------------
   14 · Pages — 关于我们页（guanyu）
   -------------------------------------------------------------------------- */

.positioning-block {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  padding: var(--space-lg) 0;
  align-items: center;
}

.positioning-text h2 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.positioning-text p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.positioning-figure img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-border);
}

.principles-block {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.principles-block > h2 {
  font-size: 1.4rem;
  margin-bottom: 24px;
}

.principles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.principle-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
}

.principle-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 12px;
}

.principle-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.principle-card p {
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.commitment-block {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
}

.commitment-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px;
}

.commitment-inner h2 {
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.commitment-inner p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 760px;
}

.commitment-inner p:last-child {
  margin-bottom: 0;
}

/* 关于页侧栏 */
.layout-shell .related-links.aside {
  margin-top: 0;
}

/* --------------------------------------------------------------------------
   15 · Pages — 404
   -------------------------------------------------------------------------- */

.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--container-pad);
}

.error-section {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  color: var(--color-accent);
  line-height: 1;
  display: block;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.error-desc {
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   16 · Footer — 全站统一页脚
   -------------------------------------------------------------------------- */

.site-footer {
  background-color: var(--color-header-bg);
  color: var(--color-header-text);
  margin-top: var(--space-xl);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.footer-brand .footer-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  display: inline-block;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  max-width: 260px;
}

.footer-col h2 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-col ul a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px var(--container-pad);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------------------------
   17 · Responsive — 响应式
   -------------------------------------------------------------------------- */

/* 平板 */
@media (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

/* 手机 */
@media (max-width: 768px) {
  :root {
    --container-pad: 16px;
    --space-xl: 56px;
    --space-lg: 40px;
  }

  /* 汉堡按钮显示 */
  .nav-toggle {
    display: flex;
  }

  /* 导航菜单收起，由 .is-open 展开 */
  .site-nav ul {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-header-bg);
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .site-nav ul.is-open {
    display: flex;
  }

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

  .header-inner {
    min-height: 60px;
  }

  /* Hero */
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .hero-text h1 {
    font-size: 1.9rem;
  }

  /* 双路径 */
  .dual-path-inner {
    grid-template-columns: 1fr;
  }

  /* 服务目录 */
  .service-grid {
    grid-template-columns: 1fr;
  }

  /* 步骤 */
  .steps-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 洞察 */
  .insight-grid {
    grid-template-columns: 1fr;
  }

  /* CTA */
  .cta-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
  }

  /* 内页布局 — 右侧栏变单栏 */
  .page-layout,
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-aside,
  .sidebar,
  .related-links.aside {
    position: static;
    margin-top: 32px;
  }

  /* 服务条目 */
  .service-item {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 方法四步 */
  .steps-grid {
    grid-template-columns: 1fr;
  }

  /* 脉络规则 */
  .timeline-rules {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* 阅读指引 */
  .reading-guide .guide-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* 流程条目 */
  .flow-item {
    grid-template-columns: 48px 1fr;
    gap: 16px;
  }

  .flow-step {
    font-size: 1.4rem;
  }

  /* 关于页 */
  .positioning-block {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  /* 页面标题 */
  .page-title {
    font-size: 1.6rem;
  }

  /* 常见问题标题区 */
  .title-figure {
    max-width: 100%;
    margin-top: 20px;
  }

  /* 404 */
  .error-code {
    font-size: 3.5rem;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .service-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-actions,
  .guide-actions,
  .flow-note-links,
  .error-actions,
  .guide-links {
    flex-direction: column;
    align-items: stretch;
  }

  .btn,
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .hero-figure img {
    aspect-ratio: 3 / 2;
  }

  .content-media-inline img {
    aspect-ratio: 4 / 3;
  }
}