/* =========================================================
   大象传媒 · 整站样式表
   艺术展览风：浅米白背景 / 黑色文字 / 陶土色强调
   ========================================================= */

/* ---------------------------------------------------------
   Base — 基础变量、重置、字体、色彩
   --------------------------------------------------------- */
:root {
  --color-bg: #f7f5f0;
  --color-ink: #222222;
  --color-accent: #b0825c;
  --color-line: #e4e0d8;
  --color-paper: #ffffff;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --header-h: 72px;
  --container-w: 1100px;
  --radius: 8px;
  --gap: 24px;
  --space-section: 88px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #8f6845;
}

ul,
ol {
  list-style: none;
}

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

h1 { font-size: 36px; }
h2 { font-size: 26px; }
h3 { font-size: 19px; }

p {
  margin-bottom: 1em;
}

/* ---------------------------------------------------------
   Layout — 全局布局骨架
   --------------------------------------------------------- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

/* ---------------------------------------------------------
   Components — Header / 导航
   --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
  height: var(--header-h);
}

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

.brand-logo {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.04em;
  flex-shrink: 0;
}

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

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-ink);
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}

.nav-list li a:hover {
  background: var(--color-line);
  color: var(--color-ink);
}

.nav-list li a.is-current {
  background: var(--color-ink);
  color: var(--color-bg);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  background: var(--color-accent);
  color: var(--color-paper);
  font-size: 15px;
  border-radius: 4px;
  flex-shrink: 0;
  transition: background 0.2s;
}

.header-cta:hover {
  background: #8f6845;
  color: var(--color-paper);
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-ink);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ---------------------------------------------------------
   Components — 面包屑 / 页面标题区
   --------------------------------------------------------- */
.breadcrumb {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 18px var(--gap) 0;
  font-size: 14px;
  color: #777;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: #777;
}

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

.breadcrumb-sep {
  color: #aaa;
}

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

.page-header {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 40px var(--gap) 28px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  color: #555;
  max-width: 720px;
}

/* ---------------------------------------------------------
   Components — 通用区块 / 标题 / 卡片 / 按钮
   --------------------------------------------------------- */
.section-block {
  padding: var(--space-section) 0;
  border-bottom: 1px solid var(--color-line);
}

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

.section-intro {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap) 36px;
}

.section-intro h2 {
  font-size: 26px;
  margin-bottom: 10px;
}

.section-intro p {
  color: #555;
  max-width: 720px;
}

.section-title {
  font-size: 26px;
  margin-bottom: 18px;
}

.text-link {
  display: inline-block;
  margin-top: 28px;
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.btn-primary,
.btn-secondary,
.btn,
.link-button,
.related-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

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

.btn-primary:hover {
  background: #8f6845;
  color: var(--color-paper);
}

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

.btn-secondary:hover {
  background: var(--color-ink);
  color: var(--color-bg);
}

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

.btn:hover {
  background: #8f6845;
  color: var(--color-paper);
}

.link-button {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.link-button:hover {
  background: var(--color-ink);
  color: var(--color-bg);
}

.related-link {
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.related-link:hover {
  background: var(--color-accent);
  color: var(--color-paper);
}

/* ---------------------------------------------------------
   Components — 图片卡片 / figure
   --------------------------------------------------------- */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 通用图片容器约束 */
.hero-media,
.hero-figure,
.project-media,
.service-media,
.about-media,
.process-media,
.content-media {
  overflow: hidden;
  background: var(--color-line);
}

/* ---------------------------------------------------------
   Components — FAQ 折叠面板
   --------------------------------------------------------- */
.faq-item {
  border-bottom: 1px solid var(--color-line);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 0;
  font-size: 17px;
  font-weight: 600;
  font-family: var(--font-serif);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s;
}

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

.faq-answer {
  padding: 0 0 20px;
  color: #555;
  max-width: 720px;
}

.faq-answer p {
  margin-bottom: 0.6em;
}

.faq-answer a {
  font-weight: 500;
}

/* ---------------------------------------------------------
   Components — 页脚
   --------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: #ccc;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 56px var(--gap) 32px;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand .footer-logo {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-paper);
  display: inline-block;
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: #aaa;
}

.footer-nav h3,
.footer-scope h3,
.footer-help h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-paper);
  margin-bottom: 16px;
  font-family: var(--font-sans);
}

.footer-nav ul li {
  margin-bottom: 10px;
}

.footer-nav ul li a {
  color: #aaa;
  font-size: 14px;
}

.footer-nav ul li a:hover {
  color: var(--color-accent);
}

.footer-scope p {
  font-size: 14px;
  color: #aaa;
  line-height: 1.7;
  margin-bottom: 10px;
}

.footer-help p {
  font-size: 14px;
  color: #aaa;
  margin-bottom: 14px;
}

.footer-help a {
  color: var(--color-accent);
  font-size: 14px;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.footer-bottom {
  border-top: 1px solid #333;
  padding: 18px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #888;
  margin: 0;
}

/* ---------------------------------------------------------
   Pages — 首页
   --------------------------------------------------------- */

/* Hero 全宽区 */
.hero-section {
  position: relative;
  background: var(--color-ink);
  min-height: 520px;
  display: flex;
  align-items: flex-end;
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-figure {
  width: 100%;
  height: 100%;
}

.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-w);
  margin: 0 auto;
  width: 100%;
  padding: 120px var(--gap) 80px;
  color: var(--color-paper);
}

.hero-content h1 {
  font-size: 48px;
  color: var(--color-paper);
  margin-bottom: 12px;
}

.hero-slogan {
  font-family: var(--font-serif);
  font-size: 22px;
  color: #e8e4dc;
  margin-bottom: 8px;
}

.hero-positioning {
  font-size: 15px;
  color: #bbb;
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

.hero-actions .btn-secondary {
  border-color: var(--color-paper);
  color: var(--color-paper);
}

.hero-actions .btn-secondary:hover {
  background: var(--color-paper);
  color: var(--color-ink);
}

/* 近期项目精选 */
.featured-projects .project-grid {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.featured-projects .project-card {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.featured-projects .project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(34, 34, 34, 0.08);
}

.featured-projects .project-card figure {
  aspect-ratio: 16 / 10;
}

.featured-projects .project-card h3 {
  padding: 18px 20px 6px;
  font-size: 18px;
}

.featured-projects .project-card p {
  padding: 0 20px;
  font-size: 14px;
  color: #666;
  margin-bottom: 14px;
}

.featured-projects .project-card a {
  display: inline-block;
  margin: 0 20px 20px;
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

/* 行业问题与适用服务 */
.painpoint-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.painpoint-list h3,
.solution-list h3 {
  font-size: 18px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
}

.painpoint-list ul li {
  position: relative;
  padding: 12px 0 12px 28px;
  font-size: 15px;
  color: #444;
  border-bottom: 1px solid #eee;
}

.painpoint-list ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.solution-list ul li {
  padding: 12px 0;
  border-bottom: 1px solid #eee;
}

.solution-list ul li a {
  font-size: 15px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.solution-list ul li a::after {
  content: "→";
  color: var(--color-accent);
}

/* 委托流程预览 */
.process-preview .process-steps {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.process-preview .process-steps li {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
}

.process-preview .process-steps li .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-ink);
  color: var(--color-bg);
  font-family: var(--font-serif);
  font-size: 16px;
  border-radius: 50%;
  margin-bottom: 16px;
}

.process-preview .process-steps li h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.process-preview .process-steps li p {
  font-size: 14px;
  color: #666;
  margin: 0;
}

/* 质量检查清单 */
.quality-checklist .checklist-grid {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.quality-checklist .checklist-grid li {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.quality-checklist .checklist-grid li h3 {
  font-size: 17px;
  margin-bottom: 10px;
  position: relative;
  padding-left: 28px;
}

.quality-checklist .checklist-grid li h3::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-size: 18px;
}

.quality-checklist .checklist-grid li p {
  font-size: 14px;
  color: #666;
  margin: 0;
}

/* 常见问题精选 */
.faq-preview .faq-item {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.faq-preview .faq-item summary {
  font-size: 16px;
}

.faq-preview .faq-item .faq-answer {
  padding-bottom: 20px;
}

.faq-preview .text-link {
  margin-left: var(--gap);
}

/* 机构简介跳转 */
.about-preview {
  background: var(--color-paper);
}

.about-preview-content {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  text-align: left;
}

.about-preview-content h2 {
  font-size: 26px;
  margin-bottom: 16px;
}

.about-preview-content p {
  max-width: 720px;
  color: #555;
  margin-bottom: 28px;
}

/* ---------------------------------------------------------
   Pages — 内页通用
   --------------------------------------------------------- */
.inner-main {
  padding-bottom: 72px;
}

/* ---------------------------------------------------------
   Pages — 创作服务页
   --------------------------------------------------------- */
.service-definition,
.service-list,
.service-scenarios,
.service-related-links {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.service-definition {
  padding-top: 8px;
  padding-bottom: 40px;
}

.service-definition p {
  color: #555;
  max-width: 720px;
}

.service-list {
  padding-bottom: 56px;
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.service-item:nth-child(even) {
  grid-template-columns: 1.2fr 1fr;
}

.service-item:nth-child(even) .service-media {
  order: 2;
}

.service-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
}

.service-content h3 {
  font-size: 21px;
  margin-bottom: 12px;
}

.service-scene,
.service-deliverable {
  font-size: 15px;
  color: #555;
}

.service-scene {
  margin-bottom: 8px;
}

.service-deliverable {
  color: #777;
}

.service-scenarios {
  padding-bottom: 48px;
}

.service-scenarios p {
  color: #555;
  max-width: 720px;
}

.service-related-links {
  padding-top: 8px;
}

.service-related-links p {
  color: #555;
  max-width: 720px;
  margin-bottom: 24px;
}

.related-link-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------------------------------------------------------
   Pages — 项目精选页
   --------------------------------------------------------- */
.portfolio-grid,
.portfolio-guide,
.portfolio-links {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.portfolio-grid {
  padding-bottom: 56px;
}

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

.project-card {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(34, 34, 34, 0.08);
}

.project-media {
  aspect-ratio: 4 / 3;
}

.project-caption {
  padding: 18px 20px 20px;
}

.project-caption h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.project-caption p {
  font-size: 14px;
  color: #666;
  margin-bottom: 12px;
}

.project-caption a {
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.portfolio-guide {
  padding-bottom: 48px;
}

.guide-text {
  color: #555;
  max-width: 720px;
}

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

.portfolio-links {
  padding-top: 8px;
}

.links-intro {
  color: #555;
  max-width: 720px;
  margin-bottom: 24px;
}

.link-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------------------------------------------------------
   Pages — 委托流程页
   --------------------------------------------------------- */
.process-overview,
.process-detail,
.delivery-checklist,
.process-faq-link {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.process-overview {
  padding-bottom: 48px;
}

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

.timeline-item {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.timeline-item .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-ink);
  color: var(--color-bg);
  font-family: var(--font-serif);
  font-size: 16px;
  border-radius: 50%;
  margin-bottom: 16px;
}

.timeline-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 14px;
  color: #666;
  margin: 0;
}

.process-detail {
  padding-bottom: 48px;
}

.phase-group {
  margin-bottom: 36px;
}

.phase-group h3 {
  font-size: 19px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
}

.action-list li {
  position: relative;
  padding: 10px 0 10px 28px;
  font-size: 15px;
  color: #444;
  border-bottom: 1px solid #eee;
}

.action-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 21px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.delivery-checklist {
  padding-bottom: 48px;
}

.checklist {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 32px;
}

.checklist li {
  padding: 12px 0;
  font-size: 15px;
  color: #444;
  border-bottom: 1px solid #eee;
}

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

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

.process-faq-link {
  padding-top: 8px;
}

.process-faq-link p {
  color: #555;
  max-width: 720px;
  margin-bottom: 24px;
}

.process-media {
  max-width: var(--container-w);
  margin: 48px auto 0;
  padding: 0 var(--gap);
  aspect-ratio: 21 / 9;
  border-radius: var(--radius);
}

.process-media figcaption {
  padding: 12px 0;
  font-size: 13px;
  color: #888;
  text-align: center;
}

.related-links {
  max-width: var(--container-w);
  margin: 40px auto 0;
  padding: 24px var(--gap);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 14px;
  color: #777;
}

.related-links-item {
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

/* ---------------------------------------------------------
   Pages — 机构档案页
   --------------------------------------------------------- */
.about-section {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.about-positioning {
  padding-top: 8px;
  padding-bottom: 48px;
}

.lead-text {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.7;
  color: var(--color-ink);
  max-width: 720px;
  margin-bottom: 20px;
}

.about-positioning p {
  color: #555;
  max-width: 720px;
}

.about-work {
  padding-bottom: 48px;
}

.work-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.work-column {
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 28px 32px;
}

.work-column h3 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
}

.work-list li {
  position: relative;
  padding: 8px 0 8px 24px;
  font-size: 15px;
  color: #444;
}

.work-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.about-media {
  max-width: var(--container-w);
  margin: 0 auto 48px;
  padding: 0 var(--gap);
  aspect-ratio: 21 / 9;
  border-radius: var(--radius);
}

.about-media figcaption {
  padding: 12px 0;
  font-size: 13px;
  color: #888;
  text-align: center;
}

.about-growth {
  padding-bottom: 48px;
}

.growth-timeline {
  position: relative;
  padding-left: 28px;
}

.growth-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-line);
}

.growth-timeline li {
  position: relative;
  padding: 0 0 32px 24px;
}

.growth-timeline li::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
}

.growth-timeline li h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.growth-timeline li p {
  font-size: 14px;
  color: #666;
  max-width: 640px;
}

.about-contact-path {
  padding-top: 8px;
  padding-bottom: 48px;
}

.about-contact-path p {
  color: #555;
  max-width: 720px;
}

.about-contact-path p a {
  font-weight: 500;
}

.about-section + .related-links {
  margin-top: 0;
}

/* ---------------------------------------------------------
   Pages — 常见问题页
   --------------------------------------------------------- */
.faq-group {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.faq-group + .faq-group {
  margin-top: 48px;
}

.faq-group-title {
  font-size: 21px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-line);
}

.content-media-inline {
  aspect-ratio: 16 / 6;
  border-radius: var(--radius);
  margin-bottom: 24px;
}

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

.faq-more-links {
  max-width: var(--container-w);
  margin: 56px auto 0;
  padding: 0 var(--gap);
}

.faq-more-title {
  font-size: 21px;
  margin-bottom: 12px;
}

.faq-more-links p {
  color: #555;
  max-width: 720px;
  margin-bottom: 24px;
}

.faq-link-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* ---------------------------------------------------------
   Pages — 404
   --------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px var(--gap);
}

.error-section {
  max-width: 640px;
  text-align: center;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 96px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}

.error-section h1 {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-desc {
  color: #666;
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------------------------------------------------------
   Responsive — 响应式断点
   --------------------------------------------------------- */

/* 平板：≤900px */
@media (max-width: 900px) {
  :root {
    --space-section: 64px;
  }

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

  .featured-projects .project-grid {
    gap: 24px;
  }

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

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

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

  .service-item,
  .service-item:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-item:nth-child(even) .service-media {
    order: 0;
  }

  .service-media {
    aspect-ratio: 16 / 9;
  }

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

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

/* 手机：≤768px */
@media (max-width: 768px) {
  :root {
    --header-h: 60px;
    --space-section: 56px;
  }

  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
  h3 { font-size: 17px; }

  /* 导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    margin-left: 0;
  }

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 0 20px;
  }

  .site-nav .nav-list li a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }

  .site-nav .nav-list li:last-child a {
    border-bottom: none;
  }

  .site-nav .nav-list li a.is-current {
    background: transparent;
    color: var(--color-accent);
  }

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

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

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

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

  .header-cta {
    display: none;
  }

  .brand-logo {
    font-size: 20px;
  }

  /* Hero */
  .hero-section {
    min-height: 420px;
  }

  .hero-content {
    padding: 80px 20px 56px;
  }

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

  .hero-slogan {
    font-size: 18px;
  }

  /* 首页网格 */
  .featured-projects .project-grid {
    grid-template-columns: 1fr;
  }

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

  .quality-checklist .checklist-grid {
    grid-template-columns: 1fr;
  }

  /* 项目精选 */
  .grid-shell {
    grid-template-columns: 1fr;
  }

  /* 流程 */
  .timeline-steps {
    grid-template-columns: 1fr;
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 14px;
    font-size: 13px;
  }

  .page-header {
    padding: 28px 20px 20px;
  }

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

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 20px 24px;
  }

  /* FAQ */
  .content-media-inline {
    aspect-ratio: 16 / 9;
  }

  /* 404 */
  .error-code {
    font-size: 72px;
  }

  /* 相关入口 */
  .related-links {
    padding: 20px;
  }
}

/* 小屏手机：≤390px 防溢出 */
@media (max-width: 390px) {
  .hero-actions,
  .link-buttons,
  .faq-link-actions,
  .error-actions,
  .related-link-group {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary,
  .link-buttons .btn-primary,
  .link-buttons .btn-secondary,
  .faq-link-actions .btn-primary,
  .faq-link-actions .btn-secondary,
  .error-actions .btn-primary,
  .error-actions .btn-secondary,
  .related-link-group .related-link {
    width: 100%;
  }

  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section-intro,
  .painpoint-layout,
  .featured-projects .project-grid,
  .process-preview .process-steps,
  .quality-checklist .checklist-grid,
  .service-definition,
  .service-list,
  .service-scenarios,
  .service-related-links,
  .portfolio-grid,
  .portfolio-guide,
  .portfolio-links,
  .process-overview,
  .process-detail,
  .delivery-checklist,
  .process-faq-link,
  .about-section,
  .faq-group,
  .faq-more-links,
  .hero-content {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-content {
    padding-top: 64px;
  }

  .process-media,
  .about-media {
    padding-left: 16px;
    padding-right: 16px;
  }

  .checklist {
    padding: 20px;
  }
}