/* ==========================================================================
   base
   ========================================================================== */

:root {
  --color-bg: #f7f5f2;
  --color-text: #242423;
  --color-accent: #b5451d;
  --color-line: #e4e1db;
  --color-panel: #ffffff;
  --font-head: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --container-width: 1200px;
  --radius: 8px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #8f3513;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.04em;
  line-height: 1.3;
}

h1 {
  font-size: 40px;
}

h2 {
  font-size: 28px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 1em;
}

/* ==========================================================================
   layout
   ========================================================================== */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.site-header {
  background-color: var(--color-panel);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.site-brand a {
  color: var(--color-text);
}

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

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

.main-nav li {
  position: relative;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.main-nav a:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.main-nav a.is-current {
  color: var(--color-accent);
  font-weight: 700;
  background-color: var(--color-bg);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px;
  border-radius: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  margin: 4px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.site-main {
  min-height: 60vh;
}

.site-footer {
  background-color: var(--color-panel);
  border-top: 1px solid var(--color-line);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
}

.footer-brand {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.footer-col p {
  font-size: 14px;
  color: #6b6a66;
  line-height: 1.7;
}

.footer-heading {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding: 16px 24px;
  text-align: center;
  font-size: 13px;
  color: #8a8985;
}

/* ==========================================================================
   components
   ========================================================================== */

/* ---------- 面包屑 ---------- */

.breadcrumb {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 24px;
  font-size: 14px;
  color: #8a8985;
}

.breadcrumb a {
  color: #6b6a66;
}

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

.breadcrumb-sep {
  margin: 0 8px;
  color: #b5b3ae;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- 按钮 ---------- */

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: #8f3513;
  border-color: #8f3513;
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid #c9c6c0;
}

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

/* ---------- 术语气泡 ---------- */

.term-bubble {
  display: inline-block;
  margin-top: 8px;
  padding: 4px 12px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  font-size: 13px;
  color: #6b6a66;
  cursor: help;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.term-bubble:hover {
  background-color: #efece7;
  border-color: #c9c6c0;
}

/* ---------- 折叠面板 ---------- */

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  padding-right: 48px;
  list-style: none;
  color: var(--color-text);
  transition: color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
}

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

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 15px;
  color: #4a4a47;
}

/* ---------- 标签 ---------- */

.tag {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  font-size: 13px;
  color: #6b6a66;
  margin: 4px 4px 4px 0;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 12px;
}

/* ---------- 图片容器 ---------- */

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: #8a8985;
  margin-top: 8px;
  line-height: 1.6;
}

/* ---------- 相关链接 ---------- */

.related-links {
  max-width: var(--container-width);
  margin: 48px auto 0;
  padding: 32px 24px;
  border-top: 1px solid var(--color-line);
}

.related-links h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.related-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  display: inline-block;
  padding: 8px 16px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  font-size: 14px;
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   pages
   ========================================================================== */

/* ---------- 首页 hero ---------- */

.hero {
  background-color: var(--color-panel);
  border-bottom: 1px solid var(--color-line);
}

.hero {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px 72px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 44px;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-slogan {
  font-size: 18px;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.hero-text {
  font-size: 16px;
  color: #4a4a47;
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-figure {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 12px 16px;
}

/* ---------- 首页 社群管理闭环 ---------- */

.closure {
  padding: 72px 0;
}

.closure-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.closure-figure {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.closure-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.closure-copy h2 {
  margin-bottom: 16px;
}

.closure-copy p {
  color: #4a4a47;
}

/* ---------- 首页 功能预览 ---------- */

.features-preview {
  background-color: var(--color-panel);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 72px 0;
}

.section-head {
  max-width: var(--container-width);
  margin: 0 auto 40px;
  padding: 0 24px;
}

.section-head h2 {
  margin-bottom: 8px;
}

.section-head p {
  color: #6b6a66;
  max-width: 720px;
}

.feature-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.feature-num {
  display: block;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.feature-item h3 {
  margin-bottom: 8px;
}

.feature-item p {
  font-size: 15px;
  color: #4a4a47;
}

.section-link {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 24px;
  text-align: right;
}

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

/* ---------- 首页 场景预览 ---------- */

.scenarios-preview {
  padding: 72px 0;
}

.scenario-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  display: block;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.scenario-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.scenario-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.scenario-card h3 {
  padding: 16px 20px 4px;
  font-size: 18px;
}

.scenario-card p {
  padding: 0 20px;
  font-size: 14px;
  color: #6b6a66;
  margin-bottom: 12px;
}

.scenario-card .tag {
  margin-left: 20px;
  margin-bottom: 16px;
}

/* ---------- 首页 数据看板 ---------- */

.dashboard-section {
  background-color: var(--color-panel);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 72px 0;
}

.dashboard-figure {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.dashboard-figure img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.dashboard-notes {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.dashboard-notes li {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 14px;
  color: #4a4a47;
}

/* ---------- 首页 实施流程 ---------- */

.process-preview {
  padding: 72px 0;
}

.process-timeline {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

.process-timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-line);
}

.process-timeline li {
  position: relative;
  padding-left: 56px;
  padding-bottom: 32px;
}

.process-timeline li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-panel);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.process-timeline h3 {
  font-size: 18px;
  margin-bottom: 4px;
}

.process-timeline p {
  color: #6b6a66;
  font-size: 15px;
  margin-bottom: 8px;
}

.process-timeline a {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 首页 FAQ ---------- */

.faq-preview {
  background-color: var(--color-panel);
  border-top: 1px solid var(--color-line);
  padding: 72px 0;
}

.faq-preview .faq-item {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.faq-preview .section-link {
  text-align: left;
}

/* ---------- 首页 服务边界 ---------- */

.boundary-section {
  padding: 72px 0;
}

.boundary-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.boundary-inner h2 {
  margin-bottom: 12px;
}

.boundary-inner p {
  color: #4a4a47;
  max-width: 720px;
}

.boundary-inner .btn-primary {
  margin-top: 8px;
}

/* ---------- 内页通用 ---------- */

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

.page-header {
  padding: 32px 0 8px;
}

.page-title {
  font-size: 36px;
}

.page-title-block {
  padding: 8px 0 32px;
}

.page-title-block p {
  color: #6b6a66;
  max-width: 720px;
}

/* ---------- 侧栏布局 ---------- */

.layout-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}

.sidebar-left {
  grid-template-columns: 260px 1fr;
}

.layout-shell .page-sidebar,
.layout-shell .page-aside,
.layout-shell .sidebar,
.layout-shell .toc-sidebar {
  position: sticky;
  top: 88px;
}

.layout-shell .page-content {
  min-width: 0;
}

/* ---------- 功能分类页 ---------- */

.toc-box {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.toc-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.toc-list li {
  margin-bottom: 6px;
}

.toc-list a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.toc-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.toc-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: #8a8985;
}

.feature-module {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

.feature-module h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.feature-module > p {
  color: #4a4a47;
  font-size: 15px;
}

.feature-module .term-bubble {
  margin-top: 12px;
}

.scenario-tip {
  margin-top: 16px;
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-accent);
  padding: 12px 16px;
}

.scenario-tip h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.scenario-tip p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

.feature-overview-image {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 32px 0;
}

.feature-overview-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.feature-overview-image figcaption {
  padding: 12px 16px;
}

.implementation-link {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
}

.implementation-link h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

/* ---------- 适用场景页 ---------- */

.scenario-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.scenario-block:nth-child(even) {
  grid-template-columns: 1fr 1fr;
}

.scenario-block:nth-child(even) .scenario-media {
  order: 2;
}

.scenario-block:nth-child(even) .scenario-content {
  order: 1;
}

.scenario-media {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.scenario-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.scenario-content h2 {
  margin-bottom: 12px;
}

.scenario-content p {
  color: #4a4a47;
}

.scenario-summary {
  padding: 48px 0;
}

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

.summary-item {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.summary-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.summary-item p {
  font-size: 14px;
  color: #6b6a66;
}

.summary-note {
  margin-top: 24px;
}

.related-card {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.related-card h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.related-card p {
  font-size: 14px;
  color: #6b6a66;
  margin-bottom: 8px;
}

.related-card a {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 使用指南页 ---------- */

.toc-aside .toc-nav {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.guide-section {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

.guide-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-intro {
  color: #6b6a66;
  font-size: 15px;
  margin-bottom: 20px;
}

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

.term-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.term-item dt {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 4px;
}

.term-item dd {
  font-size: 14px;
  color: #6b6a66;
}

.steps-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.step-block {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.step-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 12px;
}

.step-list {
  counter-reset: step;
}

.step-list li {
  counter-increment: step;
  position: relative;
  padding-left: 32px;
  padding-bottom: 8px;
  font-size: 14px;
  color: #4a4a47;
}

.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.guide-figure {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 24px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
}

.note-text {
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-accent);
  padding: 12px 16px;
  font-size: 14px;
  color: #6b6a66;
  margin-top: 20px;
}

.related-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 12px;
}

.related-links-item {
  display: inline-block;
  margin-top: 12px;
}

/* ---------- 实施流程页 ---------- */

.toc-heading {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.stage-nav-list {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.stage-nav-list li {
  margin-bottom: 6px;
}

.stage-nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.stage-nav-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.stage-content-wrap {
  min-width: 0;
}

.stage-intro-block {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.stage-section {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

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

.stage-number {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.stage-section > p {
  color: #4a4a47;
  margin-bottom: 20px;
}

.stage-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stage-detail-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.stage-detail-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.stage-detail-item ul {
  font-size: 14px;
  color: #4a4a47;
}

.stage-detail-item li {
  padding-left: 16px;
  position: relative;
  margin-bottom: 4px;
}

.stage-detail-item li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.stage-note {
  margin-top: 16px;
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-accent);
  padding: 12px 16px;
}

.stage-note p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

.stage-figure {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 24px 0;
}

.stage-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.stage-figure figcaption {
  padding: 12px 16px;
}

.stage-risk-block {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
}

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

.risk-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.risk-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.risk-item p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

.related-heading {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 12px;
}

/* ---------- 常见问题页 ---------- */

.sidebar {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.topic-index li {
  margin-bottom: 6px;
}

.topic-index a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.topic-index a:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
}

.sidebar-figure {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 16px;
}

.sidebar-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.sidebar-figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
}

.faq-group {
  margin-bottom: 32px;
}

.faq-group h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-line);
}

.faq-content {
  min-width: 0;
}

/* ---------- 服务与咨询页 ---------- */

.page-title-area {
  padding: 8px 0 32px;
}

.page-title-area p {
  color: #6b6a66;
  max-width: 720px;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.section-no {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.service-scope,
.deliverables,
.consulting,
.boundaries {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

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

.scope-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.scope-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.scope-item p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

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

.deliverable-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.deliverable-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.deliverable-item p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

.consulting-figure {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 20px;
}

.consulting-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.consulting-figure figcaption {
  padding: 12px 16px;
}

.consulting-steps {
  counter-reset: consult;
}

.consulting-steps li {
  counter-increment: consult;
  position: relative;
  padding-left: 48px;
  padding-bottom: 20px;
}

.consulting-steps li::before {
  content: counter(consult);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.consulting-steps h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.consulting-steps p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

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

.boundary-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.boundary-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.boundary-item p {
  font-size: 14px;
  color: #6b6a66;
  margin: 0;
}

/* ---------- 404 页 ---------- */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

.error-panel {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 48px 32px;
  margin-bottom: 32px;
}

.error-code {
  font-family: var(--font-head);
  font-size: 80px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-panel h1 {
  margin-bottom: 12px;
}

.error-panel p {
  color: #6b6a66;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.error-links {
  background-color: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
}

.error-links h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.error-links ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.error-links a {
  display: inline-block;
  padding: 8px 16px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: 4px;
  font-size: 14px;
  color: var(--color-text);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.error-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ==========================================================================
   responsive
   ========================================================================== */

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

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

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav ul {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-panel);
    border-bottom: 1px solid var(--color-line);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 0;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
  }

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

  .main-nav li {
    border-bottom: 1px solid var(--color-line);
  }

  .main-nav li:last-child {
    border-bottom: none;
  }

  .main-nav a {
    padding: 14px 12px;
    font-size: 16px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px 48px;
  }

  .hero-copy h1 {
    font-size: 32px;
  }

  .closure-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 48px 16px;
  }

  .features-preview {
    padding: 48px 0;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 16px;
  }

  .feature-item {
    padding: 20px;
  }

  .section-head {
    padding: 0 16px;
  }

  .scenarios-preview {
    padding: 48px 0;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 16px;
  }

  .dashboard-section {
    padding: 48px 0;
  }

  .dashboard-figure {
    padding: 0 16px;
  }

  .dashboard-notes {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 12px;
  }

  .process-preview {
    padding: 48px 0;
  }

  .process-timeline {
    padding: 0 16px;
  }

  .faq-preview {
    padding: 48px 0;
  }

  .faq-preview .faq-item {
    margin-left: 16px;
    margin-right: 16px;
  }

  .boundary-section {
    padding: 48px 0;
  }

  .boundary-inner {
    margin: 0 16px;
    padding: 24px 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 16px;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .layout-shell .page-sidebar,
  .layout-shell .page-aside,
  .layout-shell .sidebar,
  .layout-shell .toc-sidebar {
    position: static;
    order: 2;
  }

  .layout-shell .page-content {
    order: 1;
  }

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

  .breadcrumb {
    padding: 0 16px;
    margin-top: 16px;
  }

  .page-header {
    padding: 24px 0 8px;
  }

  .page-title {
    font-size: 28px;
  }

  .page-title-block {
    padding: 8px 0 24px;
  }

  .feature-module {
    padding: 20px;
  }

  .scenario-block {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 32px 0;
  }

  .scenario-block:nth-child(even) .scenario-media,
  .scenario-block:nth-child(even) .scenario-content {
    order: 0;
  }

  .summary-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

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

  .guide-section {
    padding: 20px;
  }

  .stage-detail-grid {
    grid-template-columns: 1fr;
  }

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

  .stage-section {
    padding: 20px;
  }

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

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

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

  .service-scope,
  .deliverables,
  .consulting,
  .boundaries {
    padding: 20px;
  }

  .related-links {
    padding: 24px 16px;
  }

  .related-card {
    margin-bottom: 12px;
  }

  .error-main {
    padding: 48px 16px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 56px;
  }
}

@media (max-width: 480px) {
  .hero-copy h1 {
    font-size: 28px;
  }

  .hero-slogan {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

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

  .faq-item summary {
    font-size: 15px;
    padding: 14px 44px 14px 16px;
  }

  .faq-item p {
    padding: 0 16px 14px;
    font-size: 14px;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}