:root {
  --ink: #1f3a34;
  --ink-soft: #2c4a42;
  --accent: #a8623a;
  --accent-soft: #c07a52;
  --stone: #6b6f6c;
  --stone-light: #9aa09b;
  --paper: #ffffff;
  --sand: #f4f2ed;
  --sand-deep: #e9e5dc;
  --line: #d8d4c9;
  --line-strong: #c3bdb0;
  --shell: 1180px;
  --radius: 6px;
}

/* ==========================================================================
   base — 重置、排版、全局元素
   ========================================================================== */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", sans-serif;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

p {
  margin: 0;
}

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

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

figure {
  margin: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

summary {
  cursor: pointer;
}

/* ==========================================================================
   layout — 骨架：容器、页头、导航、主区、页脚
   ========================================================================== */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 32px;
}

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

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  padding: 8px 0;
}

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

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-list > li {
  display: flex;
}

.nav-link {
  display: inline-block;
  padding: 10px 0;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-soft);
}

.nav-link.is-current {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--ink);
}

.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-strong);
  border-radius: var(--radius);
  cursor: pointer;
}

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

.site-main {
  display: block;
}

.inner-main {
  padding-bottom: 8px;
}

/* 页脚 */

.site-footer {
  margin-top: 72px;
  background: var(--sand);
  border-top: 1px solid var(--line);
}

.footer-shell {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  padding-top: 52px;
  padding-bottom: 40px;
}

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

.footer-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
  max-width: 320px;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-list a {
  font-size: 14px;
  color: var(--stone);
}

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

.footer-legal {
  padding-top: 18px;
  padding-bottom: 26px;
  border-top: 1px solid var(--line);
}

.footer-copy {
  font-size: 13px;
  color: var(--stone-light);
}

/* ==========================================================================
   components — 通用模块：区块标题、按钮、链接、卡片、表格、图片
   ========================================================================== */

.section {
  padding: 56px 0;
}

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

.section-head {
  margin-bottom: 32px;
  max-width: 760px;
}

.section-title {
  font-size: 23px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.section-lead,
.section-desc,
.section-intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.section-lead a,
.section-desc a,
.section-intro a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.section-more {
  margin-top: 26px;
  font-size: 15px;
}

.text-link {
  display: inline-block;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
  padding-bottom: 1px;
}

.text-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 22px 32px 0;
  font-size: 13px;
  color: var(--stone);
}

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

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

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

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

.page-header {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px 32px 34px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 36px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  max-width: 900px;
}

.page-description,
.page-summary,
.page-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 780px;
}

.page-kicker {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.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;
}

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

.btn-primary:hover {
  background: var(--accent);
  color: var(--paper);
}

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

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

/* 图片容器统一约束 */

.hero-media,
.scene-media,
.section-media,
.media-figure,
.scene-figure,
.positioning-figure,
.method-figure,
.prepare-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--sand-deep);
}

.hero-media img,
.scene-media img,
.section-media img,
.media-figure img,
.scene-figure img,
.positioning-figure img,
.method-figure img,
.prepare-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-caption,
.scene-caption,
.section-media-caption,
.media-caption,
.figure-caption,
figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

/* 对照栏（首页 / 交付标准共用结构，按父级限定） */

.compare-grid,
.scope-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.compare-col,
.scope-column {
  padding: 26px 28px;
  min-width: 0;
}

.compare-col + .compare-col,
.scope-column + .scope-column {
  border-left: 1px solid var(--line);
}

.compare-title,
.scope-heading {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

.compare-include .compare-title,
.scope-included .scope-heading {
  color: var(--ink);
}

.compare-exclude .compare-title,
.scope-excluded .scope-heading {
  color: var(--accent);
}

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

.compare-list li,
.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
}

.compare-list li::before,
.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--line-strong);
  border-radius: 50%;
}

.compare-include .compare-list li::before,
.scope-included .scope-list li::before {
  background: var(--ink);
}

.compare-exclude .compare-list li::before,
.scope-excluded .scope-list li::before {
  background: var(--accent);
}

/* 表格通用 */

.table-wrap,
.stage-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.mapping-table,
.stage-table {
  min-width: 560px;
  font-size: 15px;
}

.mapping-caption,
.stage-caption {
  caption-side: top;
  text-align: left;
  padding: 16px 20px;
  font-size: 13px;
  color: var(--stone);
  border-bottom: 1px solid var(--line);
}

.mapping-table th,
.mapping-table td,
.stage-table th,
.stage-table td {
  padding: 14px 20px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.mapping-table thead th,
.stage-table thead th {
  background: var(--sand);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.mapping-table tbody tr:last-child td,
.stage-table tbody tr:last-child td {
  border-bottom: 0;
}

.mapping-table td:first-child,
.stage-table td:first-child {
  color: var(--ink);
  font-weight: 500;
}

.mapping-table td,
.stage-table td {
  color: var(--stone);
}

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

.fact-bar {
  background: var(--sand);
  border-bottom: 1px solid var(--line);
}

.fact-bar-inner {
  padding-top: 12px;
  padding-bottom: 12px;
}

.fact-text {
  font-size: 13px;
  color: var(--stone);
}

.hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}

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

.hero-eyebrow {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero-title {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
  margin-bottom: 18px;
}

.hero-lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 14px;
  max-width: 520px;
}

.hero-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
  margin-bottom: 26px;
  max-width: 520px;
}

.hero-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

.hero-path-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 18px;
  font-size: 15px;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
}

.hero-path-link:hover {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}

.hero-media {
  min-width: 0;
  aspect-ratio: 4 / 3;
}

.hero-media figcaption {
  padding: 12px 2px 0;
}

/* 首页：服务方向索引 */

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

.direction-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 240px) minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.direction-index {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.direction-name {
  font-size: 18px;
  font-weight: 600;
}

.direction-link {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.direction-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-soft);
}

.direction-scene {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
  min-width: 0;
}

/* 首页：阶段条带 */

.stage-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stage-cell {
  padding: 24px 22px;
  min-width: 0;
}

.stage-cell + .stage-cell {
  border-left: 1px solid var(--line);
}

.stage-index {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.stage-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

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

.stage-parties {
  margin-bottom: 8px;
}

.stage-output {
  color: var(--ink-soft);
}

/* 首页：对接准备入口 */

.prepare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.prepare-col {
  min-width: 0;
  padding: 26px 28px;
  background: var(--sand);
  border-radius: var(--radius);
}

.prepare-subtitle {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 14px;
}

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

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

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

/* 首页：栏目索引 */

.index-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.index-cell {
  min-width: 0;
  border-right: 1px solid var(--line);
}

.index-cell:last-child {
  border-right: 0;
}

.index-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 44px;
  padding: 22px 18px;
  height: 100%;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.index-link:hover {
  background: var(--sand);
  color: var(--accent);
}

.index-desc {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--stone);
}

/* 首页：场景说明 */

.scene-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

.scene-copy {
  min-width: 0;
}

.scene-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
  margin-top: 14px;
}

.scene-media {
  min-width: 0;
  aspect-ratio: 3 / 2;
}

.scene-media figcaption {
  padding: 12px 2px 0;
}

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

.direction-group-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
}

.direction-group {
  min-width: 0;
  padding: 24px 28px 24px 0;
  border-bottom: 1px solid var(--line);
}

.direction-group:nth-child(even) {
  padding-left: 28px;
  padding-right: 0;
  border-left: 1px solid var(--line);
}

.direction-group-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.direction-group-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.section-media {
  margin: 0 0 32px;
  aspect-ratio: 21 / 9;
}

.section-media-caption {
  padding: 12px 2px 0;
}

.direction-item {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

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

.direction-item-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 14px;
}

.direction-item-index {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.direction-item-name {
  font-size: 18px;
  font-weight: 600;
}

.direction-item-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  padding-left: 38px;
}

.direction-item-scene,
.direction-item-basis {
  min-width: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.direction-item-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.entry-pair,
.next-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.entry-card {
  display: block;
  min-width: 0;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.entry-card:hover {
  border-color: var(--line-strong);
}

.entry-card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.entry-card-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
  margin-bottom: 16px;
}

.entry-card-link {
  display: inline-block;
  font-size: 15px;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.entry-card-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

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

.stage-strip-item {
  min-width: 0;
  padding: 24px 22px;
}

.stage-strip-item + .stage-strip-item {
  border-left: 1px solid var(--line);
}

.stage-num {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.stage-meta {
  font-size: 13px;
  color: var(--stone-light);
  margin-bottom: 10px;
}

.stage-summary {
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

.stage-block {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.stage-block:last-child {
  border-bottom: 1px solid var(--line);
}

.stage-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.stage-block-num {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.stage-block-name {
  font-size: 19px;
  font-weight: 600;
}

.stage-block-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding-left: 38px;
}

.stage-col {
  min-width: 0;
}

.stage-col-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.stage-party-list,
.stage-output-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.stage-party-list li,
.stage-output-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.stage-party-list li::before,
.stage-output-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--line-strong);
  border-radius: 50%;
}

.stage-output-list li::before {
  background: var(--accent);
}

.scene-figure {
  aspect-ratio: 21 / 9;
}

.scene-figure figcaption {
  padding: 12px 2px 0;
}

.checkpoint-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.checkpoint-item {
  min-width: 0;
  padding: 24px 24px 24px 0;
}

.checkpoint-item + .checkpoint-item {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.checkpoint-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.checkpoint-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.change-note {
  margin-top: 28px;
  padding: 22px 26px;
  background: var(--sand);
  border-radius: var(--radius);
}

.change-note-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.change-note-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.next-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 40px;
}

.next-main,
.next-side {
  min-width: 0;
}

.next-title,
.next-side-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

.next-desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

.next-desc a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.next-desc a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.next-side {
  padding: 24px 26px;
  background: var(--sand);
  border-radius: var(--radius);
}

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

.next-side-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.next-side-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
}

/* ==========================================================================
   pages — 交付标准
   ========================================================================== */

.deliverable-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.deliverable-item {
  min-width: 0;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.deliverable-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.deliverable-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
  margin-bottom: 16px;
}

.deliverable-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.deliverable-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.deliverable-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
}

.media-figure {
  margin-top: 32px;
  aspect-ratio: 21 / 9;
}

.media-caption {
  padding: 12px 2px 0;
}

.scope-note {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.acceptance-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.acceptance-item {
  min-width: 0;
  padding: 24px 24px 24px 0;
}

.acceptance-item + .acceptance-item {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.acceptance-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.acceptance-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

.boundary-block {
  margin-top: 28px;
  padding: 24px 26px;
  background: var(--sand);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.boundary-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.boundary-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.next-card {
  min-width: 0;
  padding: 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.next-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.next-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
  margin-bottom: 16px;
}

.next-link {
  display: inline-block;
  font-size: 15px;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.next-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.next-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--stone);
}

.next-note a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

/* ==========================================================================
   pages — 对接准备
   ========================================================================== */

.materials-list {
  border-top: 1px solid var(--line);
}

.material-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.material-index {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

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

.material-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.material-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 720px;
}

.decisions-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.decisions-main,
.decisions-aside {
  min-width: 0;
}

.decision-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.decision-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.decision-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

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

.prepare-figure figcaption {
  padding: 12px 2px 0;
}

.aside-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.entry-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.prepare-entry .entry-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 44px;
  background: var(--sand);
  border-color: transparent;
}

.prepare-entry .entry-card:hover {
  background: var(--sand-deep);
}

.entry-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}

.entry-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.entry-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

/* ==========================================================================
   pages — 关于我们
   ========================================================================== */

.positioning-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.positioning-text {
  min-width: 0;
}

.lead-text {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.positioning-text > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
  margin-bottom: 16px;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 22px 0;
}

.check-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 15px;
}

.inline-links a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.inline-links a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

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

.positioning-figure figcaption {
  padding: 12px 2px 0;
}

.method-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 40px;
}

.method-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  min-width: 0;
}

.method-index {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

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

.method-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.method-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.method-figure {
  margin-top: 36px;
  aspect-ratio: 21 / 9;
}

.method-figure figcaption {
  padding: 12px 2px 0;
}

.boundary-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.boundary-col {
  min-width: 0;
  padding: 26px 28px;
}

.boundary-col + .boundary-col {
  border-left: 1px solid var(--line);
}

.boundary-subtitle {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

.boundary-col-out .boundary-subtitle {
  color: var(--accent);
}

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

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

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

.boundary-col-out .boundary-list li::before {
  background: var(--accent);
}

.boundary-details {
  margin-top: 14px;
  padding: 18px 22px;
  background: var(--sand);
  border-radius: var(--radius);
}

.boundary-details + .boundary-details {
  margin-top: 10px;
}

.boundary-details summary {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.boundary-details summary:hover {
  color: var(--accent);
}

.boundary-details p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.disclosure-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.disclosure-main,
.disclosure-aside {
  min-width: 0;
}

.disclosure-main p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

.disclosure-main p + p {
  margin-top: 14px;
}

.disclosure-aside {
  padding: 24px 26px;
  background: var(--sand);
  border-radius: var(--radius);
}

.aside-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

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

.aside-list a {
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.aside-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent-soft);
}

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

.error-main {
  padding: 72px 0 24px;
}

.error-panel {
  max-width: 640px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 12px;
}

.error-panel h1 {
  font-size: 34px;
  font-weight: 600;
  margin-bottom: 14px;
}

.error-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--stone);
  margin-bottom: 26px;
}

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

.error-links {
  padding: 40px 0 0;
}

.error-links h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 18px;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.error-link-list li {
  min-width: 0;
  border-right: 1px solid var(--line);
}

.error-link-list li:last-child {
  border-right: 0;
}

.error-link-list a {
  display: block;
  min-height: 44px;
  padding: 18px 16px;
  font-size: 15px;
  color: var(--ink);
}

.error-link-list a:hover {
  background: var(--sand);
  color: var(--accent);
}

/* ==========================================================================
   responsive — 960px / 640px 断点
   ========================================================================== */

@media (max-width: 960px) {
  .shell {
    padding: 0 22px;
  }

  .breadcrumb,
  .page-header {
    padding-left: 22px;
    padding-right: 22px;
  }

  .header-shell {
    min-height: 60px;
    position: relative;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 12px 24px rgba(31, 58, 52, 0.08);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 22px 16px;
    display: none;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list > li {
    display: block;
  }

  .nav-link {
    display: block;
    min-height: 44px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-link.is-current {
    border-bottom-color: var(--line);
    color: var(--accent);
  }

  .hero {
    padding: 40px 0 40px;
  }

  .hero-grid,
  .scene-grid,
  .positioning-layout,
  .decisions-layout,
  .disclosure-layout,
  .next-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .hero-media,
  .scene-media,
  .positioning-figure,
  .prepare-figure {
    aspect-ratio: 16 / 10;
  }

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

  .stage-strip {
    border-bottom: 0;
  }

  .stage-cell,
  .stage-strip-item {
    border-bottom: 1px solid var(--line);
  }

  .stage-cell + .stage-cell,
  .stage-strip-item + .stage-strip-item {
    border-left: 0;
  }

  .stage-cell:nth-child(even),
  .stage-strip-item:nth-child(even) {
    border-left: 1px solid var(--line);
  }

  .checkpoint-list {
    border-bottom: 0;
  }

  .checkpoint-item,
  .acceptance-item {
    padding: 22px 22px 22px 0;
    border-bottom: 1px solid var(--line);
  }

  .checkpoint-item + .checkpoint-item,
  .acceptance-item + .acceptance-item {
    border-left: 0;
  }

  .checkpoint-item:nth-child(even),
  .acceptance-item:nth-child(even) {
    padding-left: 22px;
    border-left: 1px solid var(--line);
  }

  .acceptance-list {
    border-bottom: 0;
  }

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

  .index-cell:nth-child(3n) {
    border-right: 0;
  }

  .index-cell {
    border-bottom: 1px solid var(--line);
  }

  .index-cell:nth-last-child(-n + 3) {
    border-bottom: 0;
  }

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

  .error-link-list li {
    border-bottom: 1px solid var(--line);
  }

  .error-link-list li:nth-child(even) {
    border-right: 0;
  }

  .error-link-list li:last-child {
    border-bottom: 0;
  }

  .footer-shell {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-desc {
    max-width: none;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .shell {
    padding: 0 16px;
  }

  .breadcrumb,
  .page-header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 20px;
  }

  .page-title {
    font-size: 26px;
  }

  .hero-title {
    font-size: 27px;
  }

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

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

  .hero-path-link {
    justify-content: center;
    width: 100%;
  }

  .direction-row {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px 14px;
  }

  .direction-scene {
    grid-column: 2 / 3;
  }

  .stage-strip,
  .checkpoint-list,
  .acceptance-list,
  .index-grid,
  .prepare-grid,
  .entry-pair,
  .entry-paths,
  .next-paths,
  .deliverable-grid,
  .compare-grid,
  .scope-compare,
  .boundary-layout,
  .direction-group-list,
  .method-list,
  .direction-item-body,
  .stage-block-body {
    grid-template-columns: minmax(0, 1fr);
  }

  .stage-cell,
  .stage-strip-item,
  .checkpoint-item,
  .acceptance-item,
  .direction-group,
  .direction-group:nth-child(even) {
    padding: 20px 0;
    border-left: 0;
  }

  .stage-cell + .stage-cell,
  .stage-strip-item + .stage-strip-item,
  .checkpoint-item + .checkpoint-item,
  .acceptance-item + .acceptance-item {
    border-left: 0;
  }

  .compare-col + .compare-col,
  .scope-column + .scope-column,
  .boundary-col + .boundary-col {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .direction-item-body,
  .stage-block-body {
    padding-left: 0;
    gap: 18px;
  }

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

  .index-cell,
  .index-cell:nth-child(3n),
  .index-cell:nth-last-child(-n + 3) {
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .index-cell:nth-child(even) {
    border-right: 0;
  }

  .index-cell:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .material-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .method-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
  }

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

  .error-panel h1 {
    font-size: 26px;
  }

  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .error-link-list li {
    border-right: 0;
  }

  .footer-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .footer-brand {
    grid-column: auto;
  }

  .site-footer {
    margin-top: 56px;
  }
}