/* ============================================================
   tao5can.com · 51吃瓜网官网 完整样式表
   瑞士网格风 · 白底墨灰 · 深绿强调
   ============================================================ */

/* ------------------------------------------------------------
   Base · 基础重置与全站骨架
   ------------------------------------------------------------ */

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: #1F2421;
  background-color: #FFFFFF;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img,
figure {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  color: #1F6F5C;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #174F42;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

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

/* ------------------------------------------------------------
   Layout · 全站容器与网格骨架
   ------------------------------------------------------------ */

.header-inner,
.footer-inner,
.breadcrumb-inner,
.hero-layout,
.section-head,
.section-intro,
.service-list,
.timeline-preview,
.standard-points,
.faq-list,
.cta-section,
.page-title-inner,
.brand-story-inner,
.boundaries-inner,
.fit-clients-inner,
.extended-inner,
.page-layout,
.main-content,
.page-title-block,
.section-heading,
.method-list,
.scenario-list,
.timeline-list,
.rhythm-section,
.extended-links,
.content-block,
.deliverable-list,
.commitment-list,
.revision-list,
.sidebar-area,
.page-title-section,
.faq-group-section,
.faq-cta-section,
.contact-intro-section,
.contact-way-list,
.checklist-list,
.next-steps-list,
.cta-actions,
.error-section {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 内页主容器结构 */
.site-inner {
  width: 100%;
}

.inner-main {
  width: 100%;
  padding: 48px 0 72px;
}

/* 右侧栏两列布局 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  align-items: start;
}

.main-content {
  min-width: 0;
  max-width: 100%;
}

.aside-sidebar,
.sidebar-area {
  min-width: 0;
}

/* capability 使用 .aside-sidebar，standard/contact 使用 .sidebar-area */
.aside-sidebar,
.sidebar-area {
  width: 100%;
}

/* ------------------------------------------------------------
   Components · 通用组件
   ------------------------------------------------------------ */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: #1F6F5C;
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #174F42;
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: #1F2421;
  border: 1px solid #1F6F5C;
}

.btn-secondary:hover {
  background-color: #E8EDEA;
  color: #1F2421;
  border-color: #174F42;
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
  color: #1F6F5C;
  transition: color 0.2s ease;
}

.text-link::after {
  content: "→";
  margin-left: 6px;
  transition: transform 0.2s ease;
}

.text-link:hover {
  color: #174F42;
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* 编号标题块 */
.section-number,
.section-num,
.block-number,
.item-index,
.step-index {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: #1F6F5C;
  letter-spacing: 0.02em;
}

/* 面包屑 */
.breadcrumb {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 13px;
  color: #5A6560;
}

.breadcrumb a {
  color: #1F6F5C;
}

.breadcrumb a:hover {
  color: #174F42;
}

.breadcrumb-sep {
  margin: 0 8px;
  color: #9AA5A0;
}

.breadcrumb-current {
  color: #1F2421;
  font-weight: 500;
}

/* 面包屑导航（about 专用） */
.breadcrumb-nav {
  background-color: #F5F6F5;
  border-bottom: 1px solid #E8EDEA;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  padding: 14px 0;
}

/* 页头 */
.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.page-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.25;
  color: #1F2421;
}

/* FAQ 手风琴 */
.faq-item {
  border-bottom: 1px solid #E8EDEA;
}

.faq-item:first-child {
  border-top: 1px solid #E8EDEA;
}

.faq-question,
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 4px;
  font-size: 16px;
  font-weight: 600;
  color: #1F2421;
  cursor: pointer;
  list-style: none;
  transition: color 0.2s ease;
}

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

.faq-question::after,
.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: #1F6F5C;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-answer,
.faq-item .faq-answer {
  padding: 0 4px 20px;
  color: #4A554F;
  max-width: 72ch;
}

.faq-item .faq-answer p {
  margin-bottom: 8px;
}

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

/* 图片与图注 */
figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: #5A6560;
  line-height: 1.5;
}

.content-media img,
.hero-image,
.brand-story-figure img,
.service-figure img,
.timeline-figure img,
.content-figure img,
.media-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
}

/* 延伸阅读 */
.extended-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.extended-link {
  display: block;
  padding: 18px 20px;
  background-color: #F5F6F5;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  font-weight: 600;
  color: #1F2421;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.extended-link:hover {
  background-color: #E8EDEA;
  border-color: #1F6F5C;
  color: #1F2421;
}

/* 相关链接条 */
.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 48px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.related-links-label {
  color: #5A6560;
}

.related-links-item {
  color: #1F6F5C;
  font-weight: 500;
}

.related-links-item:hover {
  color: #174F42;
}

/* 侧栏 */
.aside-block,
.sidebar-block {
  margin-bottom: 32px;
}

.aside-title,
.sidebar-title {
  font-size: 15px;
  font-weight: 700;
  color: #1F2421;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 2px solid #1F6F5C;
}

.aside-links,
.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.aside-links a,
.sidebar-links a,
.sidebar-link {
  display: block;
  padding: 8px 4px;
  color: #1F6F5C;
  font-size: 14px;
  border-bottom: 1px solid #F0F2F1;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.aside-links a:hover,
.sidebar-links a:hover,
.sidebar-link:hover {
  color: #174F42;
  padding-left: 8px;
}

/* ------------------------------------------------------------
   Header · 页头与导航
   ------------------------------------------------------------ */

.site-header {
  width: 100%;
  background-color: #FFFFFF;
  border-bottom: 1px solid #E8EDEA;
  position: relative;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand-link {
  flex-shrink: 0;
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: #1F2421;
  letter-spacing: 0.01em;
}

.brand-text:hover {
  color: #1F6F5C;
}

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

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 500;
  color: #1F2421;
  border-radius: 4px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover {
  color: #1F6F5C;
  background-color: #F5F6F5;
}

.nav-link.is-current {
  color: #1F6F5C;
  font-weight: 700;
  background-color: #E8EDEA;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border-radius: 4px;
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #1F2421;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ------------------------------------------------------------
   Footer · 页脚
   ------------------------------------------------------------ */

.site-footer {
  width: 100%;
  background-color: #1F2421;
  color: #C9D0CC;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 40px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #9AA5A0;
  max-width: 36ch;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  font-size: 14px;
  color: #9AA5A0;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid #3A423E;
  padding: 20px 24px;
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: #7A8580;
}

/* ------------------------------------------------------------
   Pages · 首页
   ------------------------------------------------------------ */

.home-main {
  width: 100%;
}

/* 首屏 */
.hero-section {
  background-color: #FFFFFF;
  border-bottom: 1px solid #E8EDEA;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 56px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 72px;
}

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

.hero-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.2;
  color: #1F2421;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 16px;
  line-height: 1.7;
  color: #4A554F;
  margin-bottom: 32px;
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-hint {
  font-size: 13px;
  color: #7A8580;
}

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

.hero-image {
  aspect-ratio: 4 / 3;
  border-radius: 4px;
}

/* 首页通用区块 */
.home-section {
  border-bottom: 1px solid #E8EDEA;
  padding: 64px 0;
}

.home-section:nth-of-type(even) {
  background-color: #F5F6F5;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 16px;
}

.section-head .section-number {
  font-size: 18px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  color: #1F2421;
}

.section-intro {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 32px;
  max-width: 72ch;
}

/* 服务能力总览（首页） */
.service-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid #E8EDEA;
}

.service-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid #E8EDEA;
}

.service-name {
  font-size: 17px;
  font-weight: 700;
  color: #1F2421;
}

.service-desc {
  font-size: 15px;
  color: #4A554F;
  min-width: 0;
}

/* 合作流程预览 */
.timeline-preview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.timeline-step {
  padding: 24px;
  background-color: #FFFFFF;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-top: 3px solid #1F6F5C;
}

.timeline-step .step-index {
  display: block;
  font-size: 14px;
  margin-bottom: 12px;
}

.step-name {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

.process-link-wrap,
.standard-link-wrap,
.faq-link-wrap {
  margin-top: 8px;
}

/* 交付标准摘要 */
.standard-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.standard-point {
  padding: 24px;
  background-color: #FFFFFF;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-left: 3px solid #1F6F5C;
}

.point-title {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.point-desc {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 首页 FAQ */
.faq-summary .faq-list {
  max-width: 800px;
}

/* 合作引导 */
.cta-section {
  background-color: #1F2421;
  border-bottom: none;
  padding: 72px 0;
}

.cta-section .section-head {
  justify-content: center;
}

.cta-section .section-head .section-number {
  color: #7FBFAB;
}

.cta-section .section-title {
  color: #FFFFFF;
}

.cta-text {
  text-align: center;
  font-size: 16px;
  color: #C9D0CC;
  max-width: 60ch;
  margin: 0 auto 32px;
}

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

.cta-section .btn-primary {
  background-color: #FFFFFF;
  color: #1F2421;
}

.cta-section .btn-primary:hover {
  background-color: #E8EDEA;
}

.cta-section .btn-secondary {
  border-color: #7FBFAB;
  color: #FFFFFF;
}

.cta-section .btn-secondary:hover {
  background-color: #3A423E;
  border-color: #FFFFFF;
}

/* 首页首屏下方内容图 */
.content-media-primary {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.content-media-primary img {
  aspect-ratio: 21 / 9;
  border-radius: 4px;
}

/* ------------------------------------------------------------
   Pages · 关于品牌
   ------------------------------------------------------------ */

.page-title-section,
.page-title-block,
.page-title-area {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 24px;
  border-bottom: 1px solid #E8EDEA;
}

.page-title-section .section-number,
.page-title-block .block-number,
.page-title-area .section-num {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.page-intro,
.page-lead,
.title-desc,
.page-task {
  font-size: 16px;
  color: #4A554F;
  max-width: 72ch;
}

/* 品牌故事 */
.brand-story-section {
  padding: 56px 0;
  border-bottom: 1px solid #E8EDEA;
}

.brand-story-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: 48px;
  align-items: start;
}

.brand-story-content {
  min-width: 0;
}

.brand-story-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 20px;
}

.brand-story-content p {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 16px;
  line-height: 1.75;
}

.brand-story-figure {
  min-width: 0;
}

.brand-story-figure img {
  aspect-ratio: 4 / 3;
  border-radius: 4px;
}

/* 服务边界与协作原则 */
.boundaries-section {
  padding: 56px 0;
  background-color: #F5F6F5;
  border-bottom: 1px solid #E8EDEA;
}

.boundaries-inner h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

.section-lead {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 28px;
  max-width: 72ch;
}

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

.boundary-item {
  padding: 24px;
  background-color: #FFFFFF;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-left: 3px solid #1F6F5C;
}

.boundary-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.boundary-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 适合合作的客户特征 */
.fit-clients-section {
  padding: 56px 0;
  border-bottom: 1px solid #E8EDEA;
}

.fit-clients-inner h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

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

.fit-client-item {
  padding: 20px 24px;
  background-color: #F5F6F5;
  border-radius: 4px;
}

.fit-client-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 6px;
}

.fit-client-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 延伸阅读 */
.extended-section {
  padding: 56px 0;
  background-color: #F5F6F5;
}

.extended-inner h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

/* ------------------------------------------------------------
   Pages · 服务能力
   ------------------------------------------------------------ */

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

.service-matrix {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.section-heading .section-number,
.section-heading .block-number {
  font-size: 14px;
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
}

.service-matrix .service-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
  padding: 40px 0;
  border-bottom: 1px solid #E8EDEA;
}

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

.service-item-content {
  min-width: 0;
}

.service-item-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

.service-item-content .service-desc {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 16px;
  line-height: 1.7;
}

.service-detail {
  margin-bottom: 16px;
}

.service-detail dt {
  font-size: 14px;
  font-weight: 700;
  color: #1F6F5C;
  margin-bottom: 4px;
}

.service-detail dd {
  font-size: 14px;
  color: #4A554F;
  margin-bottom: 8px;
  line-height: 1.6;
}

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

.service-figure img {
  aspect-ratio: 4 / 3;
  border-radius: 4px;
}

/* 专业方法说明 */
.method-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

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

.method-item {
  padding: 24px;
  background-color: #F5F6F5;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-top: 3px solid #1F6F5C;
}

.method-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.method-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 适用场景 */
.scenario-section {
  padding: 48px 0;
}

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

.scenario-item {
  padding: 24px;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-left: 3px solid #1F6F5C;
}

.scenario-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.scenario-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* ------------------------------------------------------------
   Pages · 合作流程
   ------------------------------------------------------------ */

.timeline-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.timeline-figure {
  max-width: 800px;
  margin: 0 auto 40px;
}

.timeline-figure img {
  aspect-ratio: 21 / 9;
  border-radius: 4px;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.timeline-item {
  position: relative;
  padding: 32px;
  background-color: #F5F6F5;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-left: 4px solid #1F6F5C;
}

.timeline-item .item-index {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.timeline-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

.item-desc {
  font-size: 15px;
  color: #4A554F;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 72ch;
}

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

.role-block {
  padding: 16px 20px;
  background-color: #FFFFFF;
  border-radius: 4px;
}

.role-title {
  font-size: 14px;
  font-weight: 700;
  color: #1F6F5C;
  margin-bottom: 6px;
}

.role-block p:last-child {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 推进节奏说明 */
.rhythm-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.rhythm-text {
  font-size: 15px;
  color: #4A554F;
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 72ch;
}

.rhythm-text:last-child {
  margin-bottom: 0;
}

/* ------------------------------------------------------------
   Pages · 交付标准
   ------------------------------------------------------------ */

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

.content-block {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.block-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.block-head .section-num {
  font-size: 14px;
}

.block-head h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
}

.block-intro {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 24px;
  max-width: 72ch;
}

/* 交付物规范 */
.deliverable-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.deliverable-item {
  padding: 24px;
  background-color: #F5F6F5;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
}

.deliverable-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.deliverable-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

.content-figure {
  max-width: 720px;
}

.content-figure img {
  aspect-ratio: 16 / 9;
  border-radius: 4px;
}

/* 验收清单 */
.checklist-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  counter-reset: checklist;
}

.checklist-list li {
  counter-increment: checklist;
  position: relative;
  padding: 16px 20px 16px 56px;
  background-color: #F5F6F5;
  border-radius: 4px;
  font-size: 15px;
  color: #1F2421;
  line-height: 1.6;
}

.checklist-list li::before {
  content: counter(checklist, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 16px;
  font-weight: 700;
  color: #1F6F5C;
  font-variant-numeric: tabular-nums;
}

/* 服务承诺 */
.commitment-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.commitment-item {
  padding: 24px;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-top: 3px solid #1F6F5C;
}

.commitment-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.commitment-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 修订机制 */
.revision-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.revision-item {
  padding: 24px;
  background-color: #F5F6F5;
  border-radius: 4px;
  border-left: 3px solid #1F6F5C;
}

.revision-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.revision-item p {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 交付标准页侧栏 */
.sidebar-area {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ------------------------------------------------------------
   Pages · 常见问题
   ------------------------------------------------------------ */

.faq-howto-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 8px;
}

.faq-howto-text {
  font-size: 15px;
  color: #4A554F;
  max-width: 72ch;
}

.faq-group-section {
  padding: 40px 0;
  border-bottom: 1px solid #E8EDEA;
}

.faq-group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.faq-group-head .section-number {
  font-size: 14px;
}

.faq-group-head h2 {
  font-size: 22px;
  font-weight: 700;
  color: #1F2421;
}

.faq-group-section .faq-list {
  max-width: 800px;
}

/* FAQ CTA */
.faq-cta-section {
  padding: 56px 0;
  background-color: #F5F6F5;
  text-align: center;
}

.faq-cta-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.faq-cta-section h2 {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

.faq-cta-section p:not(.section-number) {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 24px;
}

.cta-links {
  display: flex;
  justify-content: center;
}

/* ------------------------------------------------------------
   Pages · 合作咨询
   ------------------------------------------------------------ */

.page-title-section {
  padding-bottom: 32px;
}

.page-title-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

/* 咨询介绍区 */
.contact-intro-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.contact-intro-media {
  min-width: 0;
}

.media-figure img {
  aspect-ratio: 4 / 3;
  border-radius: 4px;
}

.contact-intro-text {
  min-width: 0;
}

.contact-intro-text p {
  font-size: 15px;
  color: #4A554F;
  line-height: 1.75;
  margin-bottom: 16px;
}

/* 合作发起方式 */
.contact-way-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.contact-way-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 20px;
}

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

.contact-way-item {
  padding: 24px;
  background-color: #F5F6F5;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-top: 3px solid #1F6F5C;
}

.way-item-title {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.way-item-text {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 咨询前准备清单 */
.contact-checklist-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.contact-checklist-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.contact-checklist-section .section-intro {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 24px;
}

.contact-checklist-section .checklist-list {
  gap: 12px;
}

.checklist-item {
  position: relative;
  padding: 16px 20px 16px 56px;
  background-color: #F5F6F5;
  border-radius: 4px;
  counter-increment: checklist;
}

.checklist-item::before {
  content: counter(checklist, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 16px;
  font-weight: 700;
  color: #1F6F5C;
  font-variant-numeric: tabular-nums;
}

.checklist-title {
  font-size: 15px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 4px;
}

.checklist-text {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 下一步会发生什么 */
.contact-next-section {
  padding: 48px 0;
  border-bottom: 1px solid #E8EDEA;
}

.contact-next-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.contact-next-section .section-intro {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 24px;
}

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

.next-step-item {
  padding: 24px;
  border: 1px solid #E8EDEA;
  border-radius: 4px;
  border-left: 3px solid #1F6F5C;
}

.next-step-title {
  font-size: 16px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 8px;
}

.next-step-text {
  font-size: 14px;
  color: #4A554F;
  line-height: 1.6;
}

/* 合作咨询 CTA */
.contact-cta-section {
  padding: 48px 0;
}

.contact-cta-section .section-number {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
}

.cta-text {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 24px;
  max-width: 60ch;
}

/* 咨询页侧栏 */
.sidebar-inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.sidebar-block {
  margin-bottom: 0;
}

/* ------------------------------------------------------------
   Pages · 404
   ------------------------------------------------------------ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 200px);
  padding: 48px 24px;
}

.error-section {
  text-align: center;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #1F6F5C;
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  color: #1F2421;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #4A554F;
  margin-bottom: 32px;
  max-width: 48ch;
  margin-left: auto;
  margin-right: auto;
}

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

.error-actions .btn-primary {
  background-color: #1F6F5C;
  color: #FFFFFF;
}

.error-actions .btn-secondary {
  border-color: #1F6F5C;
  color: #1F2421;
}

/* ------------------------------------------------------------
   Responsive · 响应式
   ------------------------------------------------------------ */

/* 1080px 断点 */
@media (max-width: 1080px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }

  .service-matrix .service-item {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
  }

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

  .footer-inner {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 32px;
  }

  .footer-column:last-child {
    grid-column: span 1;
  }

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

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

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

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

/* 768px 断点 */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .site-nav {
    flex-basis: 100%;
    order: 3;
    justify-content: flex-start;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    padding: 8px 0 16px;
    border-top: 1px solid #E8EDEA;
  }

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

  .nav-link {
    display: block;
    padding: 12px 8px;
    border-bottom: 1px solid #F0F2F1;
    min-height: 44px;
  }

  .nav-link.is-current {
    background-color: transparent;
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

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

  .hero-title {
    font-size: 32px;
  }

  .hero-figure {
    order: 2;
  }

  .hero-content {
    order: 1;
  }

  /* 首页模块 */
  .service-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .timeline-preview {
    grid-template-columns: 1fr;
  }

  .standard-points {
    grid-template-columns: 1fr;
  }

  /* 内页布局 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .aside-sidebar,
  .sidebar-area {
    border-top: 1px solid #E8EDEA;
    padding-top: 32px;
  }

  /* 关于 */
  .brand-story-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .boundaries-list,
  .fit-clients-list {
    grid-template-columns: 1fr;
  }

  .extended-links {
    grid-template-columns: 1fr;
  }

  /* 服务能力 */
  .service-matrix .service-item {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-figure {
    order: 2;
  }

  .method-list,
  .scenario-list {
    grid-template-columns: 1fr;
  }

  /* 合作流程 */
  .item-roles {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 交付标准 */
  .deliverable-list,
  .commitment-list,
  .revision-list {
    grid-template-columns: 1fr;
  }

  /* 合作咨询 */
  .contact-intro-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .contact-way-list,
  .next-steps-list {
    grid-template-columns: 1fr;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

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

  /* 页头 */
  .page-header {
    padding: 32px 24px 8px;
  }

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

  /* 面包屑 */
  .breadcrumb {
    padding: 16px 24px 0;
  }

  /* 首页 CTA */
  .cta-section {
    padding: 56px 0;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-actions .btn {
    width: 100%;
    max-width: 320px;
  }

  /* 404 */
  .error-code {
    font-size: 56px;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .error-actions .btn {
    width: 100%;
    max-width: 320px;
  }
}

/* 480px 断点 */
@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .section-title {
    font-size: 22px;
  }

  .page-title {
    font-size: 24px;
  }

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

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

  .brand-story-figure img,
  .service-figure img,
  .content-figure img,
  .media-figure img {
    aspect-ratio: 4 / 3;
  }
}

/* ------------------------------------------------------------
   Print · 打印样式
   ------------------------------------------------------------ */

@media print {
  .site-header,
  .nav-toggle,
  .breadcrumb,
  .breadcrumb-nav,
  .related-links,
  .cta-actions,
  .error-actions,
  .footer-links,
  .footer-bottom,
  .aside-sidebar,
  .sidebar-area {
    display: none !important;
  }

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

  .site-main {
    padding: 0;
  }

  .inner-main {
    padding: 0;
  }

  .page-layout {
    display: block;
  }

  .main-content {
    max-width: 100%;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }

  .footer-brand-name,
  .footer-brand-desc {
    color: #000000;
  }

  .site-footer {
    background: none;
    border-top: 1px solid #CCCCCC;
    padding-top: 16px;
  }

  .footer-inner {
    display: block;
    padding: 0;
  }
}

/* ------------------------------------------------------------
   Motion · 动效（不影响初始可见性）
   ------------------------------------------------------------ */

.hero-section,
.home-section,
.page-title-section,
.page-title-block,
.page-title-area,
.brand-story-section,
.boundaries-section,
.fit-clients-section,
.extended-section,
.service-matrix,
.method-section,
.scenario-section,
.timeline-section,
.rhythm-section,
.content-block,
.faq-group-section,
.faq-cta-section,
.contact-intro-section,
.contact-way-section,
.contact-checklist-section,
.contact-next-section,
.contact-cta-section {
  animation: fade-up 0.4s ease-out both;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}