/* ============================================================
   吃瓜在线视频 — 整站样式表
   视觉方向：旅游指南风格 / 地图感配色
   配色：森林绿 #2A5C4A / 沙金黄 #E4B877 / 羊皮纸米白 #F2EEE6 / 墨灰 #3A3A3A
   ============================================================ */

/* ============================================================
   1. BASE — 基础样式
   ============================================================ */
:root {
  --color-primary: #2A5C4A;
  --color-primary-dark: #1E4436;
  --color-primary-light: #3B7A63;
  --color-accent: #E4B877;
  --color-accent-light: #F0D5A8;
  --color-bg: #F2EEE6;
  --color-surface: #FFFFFF;
  --color-text: #3A3A3A;
  --color-text-light: #6B6B6B;
  --color-border: #E0DAD0;
  --font-heading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-number: Roboto, Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --shadow-sm: 0 2px 8px rgba(42, 92, 74, 0.08);
  --shadow-md: 0 4px 16px rgba(42, 92, 74, 0.12);
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 26px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 0;
}

/* ============================================================
   2. LAYOUT — 布局骨架
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section-inner {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ============================================================
   3. HEADER — 页头导航
   ============================================================ */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

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

.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 1px;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 2px;
}

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

.nav-list {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: rgba(42, 92, 74, 0.06);
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 700;
  background-color: rgba(42, 92, 74, 0.1);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 8px;
}

.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ============================================================
   4. FOOTER — 页脚
   ============================================================ */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.footer-info {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
}

.footer-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
}

.footer-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.footer-link {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  padding: 4px 0;
}

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

.footer-copyright {
  padding-top: 20px;
  text-align: center;
}

.footer-copyright p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================================
   5. 内页公共骨架
   ============================================================ */
.site-main {
  flex: 1;
}

.site-home {
  background-color: var(--color-bg);
}

.site-inner {
  background-color: var(--color-bg);
}

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-text-light);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

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

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

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

.page-title {
  font-size: 34px;
  color: var(--color-primary);
}

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

.page-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 760px;
}

/* ============================================================
   6. COMPONENTS — 首页组件
   ============================================================ */

/* ---- Hero 主视觉 ---- */
.hero-section {
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 60%, var(--color-primary-light) 100%);
  padding: 80px 0;
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-text {
  color: #fff;
}

.hero-title {
  font-size: 36px;
  line-height: 1.3;
  color: #fff;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
  max-width: 520px;
}

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

.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-accent);
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  background-color: transparent;
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 2px solid rgba(255, 255, 255, 0.6);
  transition: background-color var(--transition), border-color var(--transition);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #fff;
  color: #fff;
}

.hero-media {
  position: relative;
}

.hero-image {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 4px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

/* ---- 核心事实条 ---- */
.facts-section {
  padding: 48px 0;
  background-color: var(--color-bg);
}

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

.fact-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  border-left: 4px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.fact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.fact-title {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.fact-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---- 服务分类入口 ---- */
.services-section {
  padding: 64px 0;
  background-color: var(--color-surface);
}

.section-heading {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: 28px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.service-icon {
  width: 52px;
  height: 52px;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.service-icon span {
  font-size: 24px;
  color: var(--color-accent);
}

.service-name {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.service-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}

.service-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.service-link::after {
  content: "→";
  transition: transform var(--transition);
}

.service-card:hover .service-link::after {
  transform: translateX(4px);
}

/* ---- 项目记录预览 ---- */
.projects-preview-section {
  padding: 64px 0;
  background-color: var(--color-bg);
}

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

.preview-card {
  display: block;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.preview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.preview-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.preview-info {
  padding: 16px 20px 20px;
}

.preview-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(42, 92, 74, 0.08);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.preview-title {
  font-size: 17px;
  color: var(--color-text);
  line-height: 1.5;
}

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

.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 8px 24px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: background-color var(--transition), color var(--transition);
}

.text-link:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ---- 制作流程路线 ---- */
.process-section {
  padding: 64px 0;
  background-color: var(--color-surface);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step-counter;
}

.process-step {
  position: relative;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border-top: 4px solid var(--color-accent);
  transition: transform var(--transition), box-shadow var(--transition);
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.process-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-accent);
  font-family: var(--font-number);
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

.process-step .step-title {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.process-step .step-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---- 下一屏预告 ---- */
.next-step-section {
  padding: 64px 0;
  background-color: var(--color-primary);
}

.next-step-content {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.next-step-title {
  font-size: 28px;
  color: #fff;
  margin-bottom: 12px;
}

.next-step-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  margin-bottom: 24px;
}

.next-step-section .btn-primary {
  font-size: 15px;
}

/* ---- 相关链接条 ---- */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  font-size: 14px;
}

.related-links-label {
  color: var(--color-text-light);
  font-weight: 600;
}

.related-links-item {
  color: var(--color-primary);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.related-links-item:hover {
  border-color: var(--color-primary);
}

/* ============================================================
   7. 内页组件 — focus-work 重点工作
   ============================================================ */
.service-block-section {
  padding: 48px 0;
  background-color: var(--color-surface);
}

.service-block-section.service-alt {
  background-color: var(--color-bg);
}

.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.service-media {
  position: relative;
}

.service-figure {
  margin: 0;
}

.service-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.service-content {
  padding: 8px 0;
}

.service-title {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

.service-detail {
  display: grid;
  gap: 12px;
}

.detail-label {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 2px;
}

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

/* ---- 流程区（内页版） ---- */
.process-section .section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.process-steps ol,
ol.process-steps {
  list-style: none;
}

/* ---- 行动区 ---- */
.next-action-section {
  padding: 56px 0;
  background-color: var(--color-primary);
}

.next-action-content {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.next-action-title {
  font-size: 26px;
  color: #fff;
  margin-bottom: 12px;
}

.next-action-desc {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  margin-bottom: 24px;
}

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

.action-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: transparent;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  transition: background-color var(--transition), border-color var(--transition);
}

.action-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #fff;
  color: #fff;
}

.action-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 700;
}

.action-primary:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
  color: var(--color-primary-dark);
}

/* ============================================================
   8. 内页组件 — projects 项目记录
   ============================================================ */
.project-cards-section {
  padding: 48px 0;
  background-color: var(--color-surface);
}

.section-heading {
  font-size: 26px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.project-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

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

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-title {
  font-size: 18px;
  color: var(--color-primary);
  padding: 16px 20px 4px;
}

.card-scene {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 0 20px 8px;
  line-height: 1.6;
}

.card-points {
  padding: 0 20px 16px;
  flex: 1;
  display: grid;
  gap: 6px;
}

.card-points li {
  font-size: 13px;
  color: var(--color-text);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.card-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.card-link {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 12px 20px;
  border-top: 1px solid var(--color-border);
  transition: background-color var(--transition);
}

.card-link:hover {
  background-color: rgba(42, 92, 74, 0.06);
}

/* ---- 过程解析 ---- */
.process-analysis-section {
  padding: 56px 0;
  background-color: var(--color-bg);
}

.analysis-block {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: start;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
}

.analysis-block:last-child {
  border-bottom: none;
}

.analysis-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.analysis-content h3 {
  font-size: 22px;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.analysis-content p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.analysis-content strong {
  color: var(--color-primary);
  font-weight: 700;
}

/* ---- 经验总结 ---- */
.lessons-section {
  padding: 56px 0;
  background-color: var(--color-surface);
}

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

.lesson-item {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border-left: 4px solid var(--color-accent);
  transition: transform var(--transition), box-shadow var(--transition);
}

.lesson-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.lesson-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-accent);
  font-family: var(--font-number);
  font-size: 16px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

.lesson-item h3 {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.lesson-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================================
   9. 内页组件 — data 数据说明
   ============================================================ */
.data-intro-section {
  padding: 32px 0 0;
  background-color: var(--color-surface);
}

.data-intro-figure {
  margin: 0;
}

.data-intro-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.data-table-section {
  padding: 48px 0;
  background-color: var(--color-surface);
}

.data-table-section .section-title {
  margin-bottom: 24px;
}

.table-scroll {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}

.data-table thead th {
  background-color: var(--color-primary);
  color: #fff;
  font-weight: 600;
  text-align: left;
  padding: 14px 20px;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  position: relative;
}

.data-table thead th::after {
  content: "⇅";
  margin-left: 6px;
  font-size: 12px;
  opacity: 0.6;
}

.data-table thead th.sort-asc::after {
  content: "↑";
  opacity: 1;
}

.data-table thead th.sort-desc::after {
  content: "↓";
  opacity: 1;
}

.data-table tbody td {
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
  line-height: 1.6;
  vertical-align: top;
}

.data-table tbody tr:nth-child(even) {
  background-color: rgba(42, 92, 74, 0.03);
}

.data-table tbody tr:hover {
  background-color: rgba(228, 184, 119, 0.1);
}

.table-hint {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 12px;
  line-height: 1.6;
}

/* ---- 数据口径说明 ---- */
.data-notes-section {
  padding: 48px 0;
  background-color: var(--color-bg);
}

.notes-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 48px;
  align-items: start;
}

.notes-main .section-title {
  margin-bottom: 16px;
}

.notes-text {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 16px;
}

.notes-aside {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.aside-title {
  font-size: 17px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.aside-list {
  display: grid;
  gap: 12px;
}

.aside-item {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.aside-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

/* ---- 服务承诺 ---- */
.commitments-section {
  padding: 48px 0;
  background-color: var(--color-surface);
}

.commitments-section .section-title {
  margin-bottom: 24px;
}

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

.commitment-card {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border-top: 4px solid var(--color-primary);
  transition: transform var(--transition), box-shadow var(--transition);
}

.commitment-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.commitment-title {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.commitment-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ---- 相关推荐 ---- */
.related-links-section {
  padding: 48px 0;
  background-color: var(--color-bg);
}

.related-links-section .section-title {
  margin-bottom: 24px;
}

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

.related-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.related-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.related-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============================================================
   10. 内页组件 — plan 未来安排
   ============================================================ */
.cooperation-steps {
  padding: 48px 0;
  background-color: var(--color-surface);
}

.cooperation-steps .section-title {
  text-align: center;
  margin-bottom: 36px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  position: relative;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border-top: 4px solid var(--color-accent);
  transition: transform var(--transition), box-shadow var(--transition);
}

.step-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-item .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-accent);
  font-family: var(--font-number);
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-item .step-title {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 8px;
}

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

/* ---- 合作场景图 ---- */
.cooperation-visual {
  padding: 0 0 48px;
  background-color: var(--color-surface);
}

.cooperation-figure {
  margin: 0;
}

.cooperation-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.cooperation-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
  padding: 12px 0 0;
}

/* ---- FAQ ---- */
.faq-section {
  padding: 48px 0;
  background-color: var(--color-bg);
}

.faq-section .section-title {
  text-align: center;
  margin-bottom: 32px;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  gap: 16px;
}

.faq-item {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item[open] {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition);
}

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

.faq-question::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item[open] .faq-question {
  color: var(--color-primary);
}

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

.faq-answer {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ---- 下一步行动 ---- */
.next-action {
  padding: 56px 0;
  background-color: var(--color-primary);
}

.next-action .section-title {
  text-align: center;
  color: #fff;
  margin-bottom: 16px;
}

.action-guide {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.action-text {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  margin-bottom: 24px;
}

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

.action-guide .action-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: transparent;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-md);
  transition: background-color var(--transition), border-color var(--transition);
}

.action-guide .action-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #fff;
  color: #fff;
}

/* ============================================================
   11. 404 页面
   ============================================================ */
.error-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
}

.error-section {
  max-width: 560px;
  text-align: center;
  padding: 80px 24px;
}

.error-code {
  font-family: var(--font-number);
  font-size: 96px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition), transform var(--transition);
}

.error-btn:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.error-help {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-text-light);
}

.error-link {
  color: var(--color-primary);
  font-weight: 600;
  margin-left: 4px;
}

.error-link:hover {
  text-decoration: underline;
}

/* ============================================================
   12. RESPONSIVE — 响应式断点
   ============================================================ */

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

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

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

  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .hero-image {
    height: 280px;
  }

  .notes-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .analysis-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .analysis-media img {
    height: 240px;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-media img {
    height: 260px;
  }
}

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

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

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: static;
    flex: 0 0 auto;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    padding: 12px 16px 20px;
    gap: 4px;
    border-bottom: 3px solid var(--color-primary);
    box-shadow: var(--shadow-md);
    align-items: stretch;
  }

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

  .nav-link {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .container,
  .section-inner,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

  .hero-description {
    font-size: 15px;
  }

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

  .btn-primary,
  .btn-secondary {
    text-align: center;
  }

  .hero-image {
    height: 220px;
  }

  .facts-section {
    padding: 32px 0;
  }

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

  .fact-card {
    padding: 20px;
  }

  .services-section,
  .projects-preview-section,
  .process-section,
  .next-step-section {
    padding: 40px 0;
  }

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

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

  .service-card {
    padding: 20px;
  }

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

  .preview-image {
    height: 180px;
  }

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

  .process-step {
    padding: 20px;
  }

  .next-step-title {
    font-size: 22px;
  }

  .page-header {
    padding: 16px 0 4px;
  }

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

  .page-description {
    font-size: 15px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  .service-block-section {
    padding: 32px 0;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-figure img {
    height: 220px;
  }

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

  .project-cards-section,
  .process-analysis-section,
  .lessons-section {
    padding: 32px 0;
  }

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

  .card-media img {
    height: 160px;
  }

  .analysis-block {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 0;
  }

  .analysis-media img {
    height: 200px;
  }

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

  .lesson-item {
    padding: 20px;
  }

  .data-intro-image {
    height: 200px;
  }

  .data-table-section,
  .data-notes-section,
  .commitments-section,
  .related-links-section {
    padding: 32px 0;
  }

  .data-table thead th,
  .data-table tbody td {
    padding: 12px 14px;
    font-size: 13px;
  }

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

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

  .commitment-card {
    padding: 20px;
  }

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

  .cooperation-steps {
    padding: 32px 0;
  }

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

  .step-item {
    padding: 20px;
  }

  .cooperation-image {
    height: 220px;
  }

  .faq-section {
    padding: 32px 0;
  }

  .faq-question {
    padding: 14px 16px;
    font-size: 15px;
  }

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

  .next-action {
    padding: 40px 0;
  }

  .action-links {
    flex-direction: column;
    align-items: stretch;
  }

  .action-link {
    text-align: center;
  }

  .error-code {
    font-size: 72px;
  }

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

  .footer-inner {
    padding: 32px 16px 20px;
  }

  .footer-info {
    flex-direction: column;
    gap: 24px;
    padding-bottom: 24px;
  }

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

  .footer-nav-list {
    gap: 8px 16px;
  }

  .footer-link {
    font-size: 13px;
  }

  .related-links {
    padding: 16px;
    gap: 8px 16px;
    font-size: 13px;
  }
}

/* ---- 小屏手机（≤390px） ---- */
@media (max-width: 390px) {
  .brand-name {
    font-size: 16px;
  }

  .nav-list {
    top: 60px;
  }

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

  .hero-description {
    font-size: 14px;
  }

  .hero-image {
    height: 200px;
  }

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

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

  .service-figure img {
    height: 200px;
  }

  .analysis-media img {
    height: 180px;
  }

  .data-intro-image {
    height: 180px;
  }

  .cooperation-image {
    height: 200px;
  }
}