:root {
  --ink: #14181f;
  --ink-soft: #4b5563;
  --paper: #ffffff;
  --paper-alt: #f4f6f9;
  --brand: #2f4b8f;
  --brand-soft: #e7ecf7;
  --line: #d9dee7;
  --radius: 6px;
  --radius-sm: 4px;
  --shell: 1120px;
  --gap-lg: 40px;
  --gap-md: 24px;
  --gap-sm: 14px;
  --shadow-card: 0 1px 2px rgba(20, 24, 31, 0.06);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

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

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  font-weight: 400;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.18s ease;
}

a:hover,
a:focus-visible {
  color: #1f3468;
}

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

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* =========================================================
   layout — 全站骨架
   ========================================================= */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
}

.brand-note {
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.4;
}

.brand:hover,
.brand:focus-visible {
  color: var(--brand);
}

.site-nav {
  display: block;
}

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

.nav-item {
  display: block;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-radius: var(--radius-sm);
  transition: background-color 0.18s ease, color 0.18s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--brand);
  background: var(--brand-soft);
}

.nav-link.is-current {
  color: var(--brand);
  font-weight: 600;
  background: var(--brand-soft);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px 24px 72px;
}

/* =========================================================
   components — 通用组件
   ========================================================= */

.section {
  padding: 56px 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.home-main .section {
  padding: 56px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 28px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-note,
.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.section-intro {
  margin-bottom: 22px;
}

.section-more {
  margin-top: 22px;
  font-size: 15px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.text-link::after {
  content: "→";
  font-size: 14px;
}

.text-link:hover,
.text-link:focus-visible {
  border-bottom-color: var(--brand);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
}

.link-arrow::after {
  content: "→";
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #24396e;
  border-color: #24396e;
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-1px);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--brand);
}

.breadcrumb-sep {
  color: var(--line);
}

.breadcrumb-current {
  color: var(--ink);
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  padding-bottom: 28px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line);
  max-width: 860px;
}

.page-title {
  font-size: 34px;
  margin-bottom: 14px;
}

.page-description,
.page-lead {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.page-description a,
.page-lead a {
  font-weight: 500;
  border-bottom: 1px solid var(--brand-soft);
}

.page-description a:hover,
.page-lead a:hover {
  border-bottom-color: var(--brand);
}

/* 图片容器 */
.media-figure,
.section-figure,
.section-media,
.aside-media,
.faq-map-figure,
.hero-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-alt);
}

.media-figure img,
.section-figure img,
.section-media img,
.aside-media img,
.faq-map-figure img,
.hero-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.media-caption,
.figure-caption,
.faq-map-figure figcaption,
.aside-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.media-figure-wide img {
  max-height: 340px;
}

/* =========================================================
   pages — 首页
   ========================================================= */

/* 首屏 */
.hero {
  padding: 48px 0 8px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap-lg);
  align-items: center;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

.hero-lead {
  max-width: 560px;
}

.hero-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
}

.hero-title {
  font-size: 34px;
  line-height: 1.4;
  margin-bottom: 16px;
}

.hero-text {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 20px;
}

.hero-points {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 26px;
}

.hero-point {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--ink);
  line-height: 1.7;
}

.hero-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  background: var(--brand);
  border-radius: 2px;
}

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

.hero-media {
  min-width: 0;
}

.hero-figure img {
  aspect-ratio: 4 / 3;
}

.hero-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

/* 场景选择 */
.scene-picker {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 8px;
}

.scene-picker-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.scene-picker-note {
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 720px;
  margin-bottom: 24px;
}

.scene-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

.scene-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.scene-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}

.scene-name {
  font-size: 18px;
}

.scene-task {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
  flex: 1 1 auto;
}

.scene-link {
  font-size: 15px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.scene-link::after {
  content: "→";
  font-size: 14px;
}

/* 服务方向总览 */
.section-directions {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
}

.home-main .section-directions {
  border-top: 1px solid var(--line);
  margin-top: 48px;
}

.direction-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.direction-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: var(--gap-md);
  align-items: center;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease, padding-left 0.18s ease;
}

.direction-row:hover {
  background: var(--paper-alt);
  padding-left: 12px;
}

.direction-index {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--brand);
  font-weight: 500;
}

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

.direction-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.direction-for {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.direction-link {
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.direction-link::after {
  content: "→";
  font-size: 14px;
}

/* 用户角色 */
.section-roles {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
  border-top: 1px solid var(--line);
}

.role-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

.role-column {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.role-name {
  font-size: 18px;
}

.role-task {
  font-size: 15px;
  line-height: 1.75;
}

.role-blocker {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.role-support {
  font-size: 14px;
  color: var(--brand);
  line-height: 1.7;
}

.section-roles .section-figure {
  margin-top: 28px;
}

/* 合作流程预览 */
.section-flow {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
  border-top: 1px solid var(--line);
}

.stage-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap-md);
}

.stage-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  border-radius: var(--radius);
  background: var(--paper);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.stage-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.stage-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brand);
  font-weight: 500;
}

.stage-name {
  font-size: 17px;
}

.stage-party,
.stage-output {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* 交付范围摘要 */
.section-scope {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
  border-top: 1px solid var(--line);
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
}

.scope-column {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.scope-name {
  font-size: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--brand-soft);
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-item {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.scope-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}

.section-scope .section-figure {
  margin-top: 28px;
}

/* FAQ 折叠 */
.section-faq {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
  border-top: 1px solid var(--line);
}

.faq-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  position: relative;
  display: block;
  padding: 18px 44px 18px 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  transition: color 0.18s ease;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  color: var(--brand);
  line-height: 1;
}

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

.faq-question:hover {
  color: var(--brand);
}

.faq-answer {
  padding: 0 44px 20px 4px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* 站内栏目索引 */
.section-index {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px;
  border-top: 1px solid var(--line);
}

.index-columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--gap-md);
}

.index-column {
  min-width: 0;
  padding: 18px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.index-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.index-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* =========================================================
   pages — 内页通用
   ========================================================= */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--gap-lg);
  align-items: start;
}

.layout-main {
  min-width: 0;
}

.layout-aside {
  min-width: 0;
}

.layout-main .section {
  padding: 0 0 44px;
}

.layout-main .section + .section {
  padding-top: 44px;
}

.layout-main .section-title {
  font-size: 24px;
  margin-bottom: 12px;
}

.aside-block {
  padding: 20px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-block + .aside-block {
  margin-top: 24px;
}

.aside-title {
  font-size: 17px;
  margin-bottom: 12px;
}

.aside-intro {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
  margin-bottom: 14px;
}

.aside-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* =========================================================
   pages — 服务方向
   ========================================================= */

.section-directions .direction-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
  border-top: none;
  margin-top: 26px;
}

.direction-item {
  padding: 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  background: var(--paper);
  scroll-margin-top: 90px;
}

.direction-no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
}

.direction-item .direction-name {
  font-size: 19px;
  margin-bottom: 10px;
}

.direction-def {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 14px;
}

.direction-meta {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 8px 16px;
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
}

.direction-meta dt {
  color: var(--ink-soft);
  font-weight: 500;
}

.direction-meta dd {
  margin: 0;
  color: var(--ink);
  line-height: 1.7;
}

.section-compare {
  padding-top: 0;
}

.compare-table {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}

.compare-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

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

.compare-head {
  background: var(--brand-soft);
  font-weight: 600;
}

.compare-cell {
  padding: 12px 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  border-right: 1px solid var(--line);
}

.compare-cell:last-child {
  border-right: none;
}

.compare-col-direction {
  font-weight: 500;
}

.compare-head .compare-cell {
  color: var(--brand);
}

.aside-roles .role-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.role-item {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.role-item:first-child {
  padding-top: 0;
  border-top: none;
}

.role-item .role-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.role-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.advice-list {
  counter-reset: advice;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.advice-item {
  position: relative;
  padding-left: 30px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.advice-item::before {
  counter-increment: advice;
  content: counter(advice);
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 20px;
  text-align: center;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 50%;
}

/* =========================================================
   pages — 合作流程
   ========================================================= */

.flow-section,
.flow-detail-section,
.flow-obstacle-section,
.flow-checklist-section,
.flow-next-section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.flow-section {
  padding-top: 0;
  border-top: none;
}

.flow-figure {
  margin-bottom: 28px;
}

.flow-figure img {
  max-height: 320px;
}

.flow-timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap-md);
}

.flow-step {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-alt);
}

.flow-step-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brand);
  margin-bottom: 8px;
}

.flow-step-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.flow-step-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.flow-detail {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.flow-detail + .flow-detail {
  margin-top: 20px;
}

.flow-detail-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.flow-detail-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.flow-detail-name {
  font-size: 19px;
}

.flow-detail-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-md);
}

.flow-detail-col {
  min-width: 0;
}

.flow-detail-col-title {
  font-size: 15px;
  color: var(--brand);
  margin-bottom: 10px;
}

.flow-detail-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.flow-detail-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.flow-detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}

.obstacle-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-md);
}

.obstacle-item {
  padding: 20px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.obstacle-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.obstacle-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.checklist-figure {
  margin-bottom: 24px;
  max-width: 720px;
}

.checklist-figure img {
  max-height: 300px;
}

.checklist-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--gap-sm);
  counter-reset: checklist;
}

.checklist-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  border-radius: var(--radius);
  background: var(--paper);
}

.checklist-name {
  font-size: 15px;
  margin-bottom: 8px;
}

.checklist-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.flow-next-section {
  padding-bottom: 0;
  border-top: none;
}

.flow-next-text {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
  max-width: 760px;
  margin-bottom: 18px;
}

.flow-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

/* =========================================================
   pages — 交付范围
   ========================================================= */

.delivery-items .section-media {
  margin-bottom: 24px;
}

.delivery-items .section-media img {
  max-height: 300px;
}

.delivery-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.delivery-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease;
}

.delivery-row:hover {
  background: var(--paper-alt);
}

.delivery-code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brand);
  font-weight: 500;
}

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

.delivery-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.delivery-desc {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 8px;
}

.delivery-cat {
  display: inline-block;
  font-size: 13px;
  color: var(--brand);
  background: var(--brand-soft);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.standard-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-md);
}

.standard-item {
  padding: 20px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.standard-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.standard-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.out-of-scope .scope-columns {
  gap: var(--gap-md);
}

.scope-col {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-excluded {
  background: var(--paper-alt);
}

.scope-alternative {
  background: var(--paper);
  border-color: var(--brand-soft);
}

.scope-col-title {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.scope-col .scope-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.delivery-aside .aside-media {
  margin-bottom: 16px;
}

.delivery-aside .aside-media img {
  max-height: 180px;
}

.step-list {
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-item {
  position: relative;
  padding-left: 32px;
}

.step-index {
  position: absolute;
  left: 0;
  top: 2px;
  width: 22px;
  height: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 22px;
  text-align: center;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 50%;
}

.step-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.next-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.next-item a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
}

.next-item a::after {
  content: "→";
  font-size: 14px;
}

/* =========================================================
   pages — 问题解答
   ========================================================= */

.faq-map {
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.faq-map-figure {
  max-width: 720px;
}

.faq-map-figure img {
  max-height: 300px;
}

.faq-group {
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

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

.faq-group .section-head {
  margin-bottom: 18px;
}

.faq-group .faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--paper);
  overflow: hidden;
}

.faq-group .faq-question {
  padding-left: 18px;
}

.faq-group .faq-answer {
  padding-left: 18px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.faq-next-step {
  padding: 24px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.next-step-title {
  font-size: 17px;
  margin-bottom: 12px;
}

.next-step-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.next-step-item {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.next-step-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}

/* =========================================================
   pages — 404
   ========================================================= */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px 88px;
}

.error-section {
  width: 100%;
  max-width: 720px;
  text-align: center;
}

.error-section h1 {
  font-size: 34px;
  margin-bottom: 16px;
}

.error-lead {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.error-tips {
  padding: 24px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: left;
}

.error-tips h2 {
  font-size: 17px;
  margin-bottom: 12px;
}

.error-tip-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.error-tip-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
}

.error-tip-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--brand);
  border-radius: 50%;
}

/* =========================================================
   footer
   ========================================================= */

.site-footer {
  margin-top: auto;
  background: #101725;
  color: #c7cfdd;
  border-top: 1px solid #1c2740;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: var(--gap-md);
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 32px;
}

.footer-brand {
  min-width: 0;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 10px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.75;
  color: #9aa6bb;
}

.footer-group {
  min-width: 0;
}

.footer-group-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 14px;
}

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

.footer-list a {
  font-size: 14px;
  color: #9aa6bb;
  line-height: 1.6;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #ffffff;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 24px 28px;
  border-top: 1px solid #1c2740;
}

.footer-copy,
.footer-note {
  font-size: 13px;
  color: #7c8798;
  line-height: 1.7;
}

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

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .hero-lead {
    max-width: none;
  }

  .scene-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .role-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stage-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
  }

  .layout-aside {
    max-width: 640px;
  }

  .compare-row {
    grid-template-columns: 120px minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  }

  .flow-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .checklist-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 12px 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 20px rgba(20, 24, 31, 0.08);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 12px 14px;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
  }

  .nav-list.is-open {
    max-height: 70vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-link {
    display: flex;
    width: 100%;
    min-height: 44px;
    padding: 10px 14px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .inner-main {
    padding: 20px 18px 56px;
  }

  .hero {
    padding: 32px 0 4px;
  }

  .hero-inner,
  .scene-picker,
  .section-directions,
  .section-roles,
  .section-flow,
  .section-scope,
  .section-faq,
  .section-index {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-title,
  .page-title,
  .error-section h1 {
    font-size: 26px;
  }

  .section-title,
  .scene-picker-title,
  .layout-main .section-title {
    font-size: 20px;
  }

  .scene-list,
  .role-columns,
  .stage-strip,
  .index-columns,
  .scope-columns,
  .standard-list,
  .obstacle-list,
  .flow-timeline,
  .flow-detail-body,
  .checklist-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .direction-row {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 14px;
    align-items: start;
  }

  .direction-link {
    grid-column: 2;
    margin-top: 4px;
  }

  .delivery-row {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 14px;
  }

  .compare-table {
    overflow-x: auto;
  }

  .compare-row {
    grid-template-columns: 100px minmax(160px, 1fr) minmax(160px, 1fr) minmax(160px, 1fr);
    min-width: 640px;
  }

  .direction-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .direction-meta dd {
    margin-bottom: 8px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 36px 18px 24px;
  }

  .footer-bottom {
    padding: 16px 18px 24px;
  }

  .error-main {
    padding: 48px 18px 64px;
  }
}