/* ============================================================
   51吃瓜官网入口 · 全站样式表
   报纸编辑风格 · 黑白基调 · 细分隔线 · 少量强调色
   ============================================================ */

/* ============================================================
   01 · Base（基础变量与重置）
   ============================================================ */
:root {
  --color-text: #111111;
  --color-text-secondary: #3a3a3a;
  --color-bg: #f5f5f3;
  --color-card: #ffffff;
  --color-accent: #b0452e;
  --color-accent-dark: #8f3622;
  --color-border: #d8d8d2;
  --color-border-light: #e8e8e3;
  --font-serif: "Noto Serif SC", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --container-padding: 24px;
  --header-height: 72px;
  --radius: 6px;
  --radius-sm: 4px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

p:last-child {
  margin-bottom: 0;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   02 · Layout（全站布局骨架）
   ============================================================ */

/* 站点根布局 */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-home,
.site-inner {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

.site-error {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

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

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
  padding-bottom: 64px;
}

/* 统一内容容器 */
.header-inner,
.footer-inner,
.hero-section,
.service-matrix-section,
.method-process-section,
.quality-summary-section,
.faq-preview-section,
.contact-entry-section,
.inner-main > section,
.inner-main > div,
.inner-main > nav,
.page-header,
.breadcrumb {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ============================================================
   03 · Header（页头与导航）
   ============================================================ */

.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  flex-shrink: 0;
}

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

.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

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

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

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

.nav-list li {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-text);
}

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

/* 移动端汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  flex-shrink: 0;
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.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);
}

/* ============================================================
   04 · Breadcrumb（面包屑）
   ============================================================ */

.breadcrumb {
  padding-top: 16px;
  padding-bottom: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-border);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   05 · Page Header（内页标题区）
   ============================================================ */

.page-header {
  padding-top: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
}

.page-title-area,
.page-title-block {
  margin-bottom: 32px;
}

.page-title-area .page-intro,
.page-title-block p,
.page-title-inner p {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 760px;
  line-height: 1.7;
}

/* ============================================================
   06 · Buttons（按钮）
   ============================================================ */

.btn-primary,
.btn-secondary,
.entry-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
  border: 1px solid var(--color-accent);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* ============================================================
   07 · Section Heading（区块标题）
   ============================================================ */

.section-heading {
  margin-bottom: 32px;
}

.section-heading h2 {
  font-size: 24px;
  margin-bottom: 8px;
  position: relative;
  padding-bottom: 12px;
}

.section-heading h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-accent);
}

.section-heading p {
  color: var(--color-text-secondary);
  font-size: 15px;
  max-width: 720px;
}

/* ============================================================
   08 · Hero（首页首屏）
   ============================================================ */

.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 56px;
  padding-bottom: 56px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-content h1 {
  font-size: 36px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-border);
  padding-left: 12px;
  max-width: 480px;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-card);
}

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* ============================================================
   09 · 首页 · 服务矩阵
   ============================================================ */

.service-matrix-section {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

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

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  border-color: var(--color-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.card-media {
  width: 100%;
  overflow: hidden;
}

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

.service-card h3 {
  padding: 20px 20px 8px;
  font-size: 18px;
}

.service-card p {
  padding: 0 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  flex: 1;
}

.card-link {
  display: inline-flex;
  align-items: center;
  margin: 16px 20px 20px;
  font-size: 14px;
  font-weight: 600;
}

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

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

/* ============================================================
   10 · 首页 · 工作方法简览
   ============================================================ */

.method-process-section {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px 20px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

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

.step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.method-link,
.quality-link,
.faq-more-link {
  text-align: right;
}

.text-link {
  display: inline-flex;
  align-items: center;
  font-size: 15px;
  font-weight: 600;
  padding: 8px 0;
}

.text-link::after {
  content: "→";
  margin-left: 8px;
  transition: transform 0.2s ease;
}

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

/* ============================================================
   11 · 首页 · 质量标准摘要
   ============================================================ */

.quality-summary-section {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.quality-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.quality-item {
  background-color: var(--color-card);
  border-top: 2px solid var(--color-border);
  padding: 20px;
}

.quality-index {
  display: block;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.quality-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.quality-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   12 · 首页 · FAQ 预览
   ============================================================ */

.faq-preview-section {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

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

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: var(--color-bg);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   13 · 首页 · 合作咨询入口
   ============================================================ */

.contact-entry-section {
  padding-top: 48px;
  padding-bottom: 48px;
}

.contact-banner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.contact-banner h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.contact-banner p {
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto 24px;
}

/* ============================================================
   14 · 首页 · 页尾相关链接
   ============================================================ */

.related-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-top: 16px;
  padding-bottom: 16px;
  border-top: 1px solid var(--color-border-light);
}

.related-links-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-right: 8px;
  font-weight: 600;
}

.related-links-item {
  font-size: 14px;
  padding: 6px 12px;
  border: 1px solid var(--color-border-light);
  border-radius: 999px;
  color: var(--color-text-secondary);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* ============================================================
   15 · Footer（页脚）
   ============================================================ */

.site-footer {
  background-color: #1a1a1a;
  color: #c8c8c4;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-brand h3 {
  font-size: 18px;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: #a8a8a4;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col h3 {
  font-size: 16px;
  color: #ffffff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #3a3a3a;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: 14px;
  color: #a8a8a4;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #3a3a3a;
  padding-top: 16px;
  padding-bottom: 16px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #888884;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ============================================================
   16 · 内页 · 服务内容页
   ============================================================ */

/* 服务总述 */
.service-intro-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding-top: 8px;
  padding-bottom: 40px;
}

.service-intro-text h2 {
  margin-bottom: 12px;
}

.service-intro-text p {
  color: var(--color-text-secondary);
}

.service-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.service-intro-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

/* 服务分类区块 */
.service-category-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.category-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.category-media figure {
  margin: 0;
}

.category-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.category-content h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.category-content p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.category-content h3 {
  font-size: 16px;
  margin-top: 16px;
  margin-bottom: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
}

.deliverable-list {
  margin-top: 8px;
}

.deliverable-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

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

/* 服务边界 */
.service-boundary-section {
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.service-boundary-section h2 {
  margin-bottom: 12px;
}

.service-boundary-section > p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 720px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.boundary-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-left: 3px solid var(--color-border);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 相关入口 */
.related-entry-section {
  padding-top: 40px;
  padding-bottom: 40px;
}

.related-entry-section h2 {
  margin-bottom: 20px;
}

.related-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px;
  display: block;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card:hover {
  border-color: var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

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

.related-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* ============================================================
   17 · 内页 · 工作方法页
   ============================================================ */

.page-container {
  width: 100%;
}

.method-intro {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding-bottom: 40px;
}

.method-intro-text p {
  color: var(--color-text-secondary);
}

.method-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.method-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.method-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
}

/* 流程步骤 */
.process-section {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.process-section h2 {
  margin-bottom: 24px;
}

.process-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.process-step:first-child {
  border-top: 1px solid var(--color-border-light);
}

.process-step .step-number {
  width: 48px;
  height: 48px;
  font-size: 20px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-accent);
}

.step-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.step-client {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-border);
  padding-left: 12px;
}

/* 交付物 */
.deliverables-section {
  padding-top: 40px;
  padding-bottom: 48px;
}

.deliverables-section h2 {
  margin-bottom: 24px;
}

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

.deliverable-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 20px;
}

.deliverable-item h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.deliverable-item ul li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-left: 14px;
  position: relative;
  margin-bottom: 6px;
}

.deliverable-item ul li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* 咨询入口 */
.next-entry {
  padding-top: 40px;
  padding-bottom: 8px;
}

.next-entry-content {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 40px;
  text-align: center;
}

.next-entry-content h2 {
  margin-bottom: 12px;
}

.next-entry-content p {
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 24px;
}

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

.entry-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 14px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* ============================================================
   18 · 内页 · 质量标准页
   ============================================================ */

.quality-item-list {
  padding-top: 8px;
  padding-bottom: 40px;
}

.quality-item-list h2 {
  margin-bottom: 24px;
}

.quality-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.quality-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.quality-number {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 12px;
}

.quality-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.quality-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 配图 */
.quality-media-block {
  padding-top: 8px;
  padding-bottom: 40px;
}

.quality-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.quality-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.quality-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
}

/* 审核流程 */
.audit-flow {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.audit-flow h2 {
  margin-bottom: 24px;
}

.audit-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.audit-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.step-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 12px;
}

.audit-step h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.audit-step p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 保密说明 */
.confidentiality {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.confidentiality h2 {
  margin-bottom: 16px;
}

.confidentiality-content > p {
  color: var(--color-text-secondary);
  max-width: 760px;
  margin-bottom: 20px;
}

.confidentiality-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.confidentiality-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-left: 3px solid var(--color-accent);
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 相关入口 */
.related-entry {
  padding-top: 8px;
  padding-bottom: 40px;
}

.related-entry h2 {
  margin-bottom: 20px;
}

.related-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ============================================================
   19 · 内页 · 关于我们页
   ============================================================ */

.about-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  padding-top: 8px;
  padding-bottom: 48px;
}

.intro-text h2 {
  margin-bottom: 12px;
}

.intro-text p {
  color: var(--color-text-secondary);
}

.intro-image {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.intro-image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.intro-image figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
}

/* 服务理念 */
.mission-cards {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.mission-cards h2 {
  margin-bottom: 8px;
}

.section-lead {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 680px;
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.mission-card {
  background-color: var(--color-card);
  border-top: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.mission-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  position: relative;
  padding-left: 16px;
}

.mission-card h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.mission-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 专业方向 */
.expertise-list {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.expertise-list h2 {
  margin-bottom: 8px;
}

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

.expertise-items li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.expertise-items h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.expertise-items p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 站内导航 */
.site-guide {
  padding-top: 40px;
  padding-bottom: 40px;
  border-top: 1px solid var(--color-border);
}

.site-guide h2 {
  margin-bottom: 8px;
}

.guide-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.guide-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 20px;
  display: block;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.guide-card:hover {
  border-color: var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.guide-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--color-text);
}

.guide-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================
   20 · 内页 · 常见问题页
   ============================================================ */

.page-title-area .content-media {
  margin-top: 24px;
}

.content-media-inline {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  max-width: 760px;
}

.content-media-inline img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
}

/* FAQ 分组 */
.faq-group {
  padding-top: 40px;
  padding-bottom: 40px;
  border-top: 1px solid var(--color-border);
}

.faq-group-header {
  margin-bottom: 20px;
}

.faq-group-header h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.faq-group-header p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.faq-group .faq-list {
  max-width: 100%;
}

.faq-answer {
  padding: 0 20px 16px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* 咨询入口 */
.contact-entry {
  padding-top: 40px;
  padding-bottom: 48px;
}

.contact-entry-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 40px;
  text-align: center;
}

.contact-entry-inner h2 {
  margin-bottom: 12px;
}

.contact-entry-inner p {
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 24px;
}

/* ============================================================
   21 · 内页 · 合作咨询页
   ============================================================ */

.page-title-inner {
  margin-bottom: 32px;
}

/* 咨询简介 */
.contact-intro {
  padding-top: 8px;
  padding-bottom: 40px;
}

.contact-intro-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
}

.contact-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.contact-intro-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.contact-intro-text h2 {
  margin-bottom: 12px;
}

.contact-intro-text p {
  color: var(--color-text-secondary);
}

/* 合作步骤 */
.cooperation-steps {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

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

.steps-grid .step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px 20px;
}

.steps-grid .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.steps-grid .step-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.steps-grid .step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 准备清单 */
.checklist {
  padding-top: 40px;
  padding-bottom: 48px;
  border-top: 1px solid var(--color-border);
}

.checklist-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: start;
}

.checklist-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 12px;
}

.checklist-list strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
  color: var(--color-text);
}

.checklist-list p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

.checklist-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.checklist-note h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
}

.checklist-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* 相关链接 */
.related-links {
  padding-top: 8px;
  padding-bottom: 40px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-grid .related-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius);
  padding: 24px;
  display: block;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-grid .related-card:hover {
  border-color: var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.related-grid .related-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.related-grid .related-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.related-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
}

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

.related-grid .related-card:hover .related-link::after {
  transform: translateX(3px);
}

/* ============================================================
   22 · 404 页面
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

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

.error-code {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

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

/* ============================================================
   23 · 动效增强（不阻碍初始可见性）
   ============================================================ */

@media (prefers-reduced-motion: no-preference) {
  .service-card,
  .step-item,
  .quality-item,
  .deliverable-item,
  .quality-card,
  .mission-card,
  .guide-card,
  .related-card {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
  }
}

/* ============================================================
   24 · Responsive（响应式）
   ============================================================ */

/* 平板：1024px 以下 */
@media (max-width: 1024px) {
  :root {
    --container-padding: 20px;
  }

  .hero-section {
    gap: 32px;
  }

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

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

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

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

/* 手机：768px 以下 */
@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --header-height: 60px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 16px;
  }

  /* 页头：显示汉堡按钮，收起导航列表 */
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    display: block;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .main-nav.is-open {
    max-height: 320px;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-link {
    padding: 12px 20px;
    border-bottom: 1px solid var(--color-border-light);
    border-left: 3px solid transparent;
    font-size: 15px;
  }

  .nav-link.is-current {
    border-left-color: var(--color-accent);
    border-bottom-color: var(--color-border-light);
    background-color: var(--color-bg);
  }

  /* Hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 32px;
    padding-bottom: 32px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

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

  /* 服务矩阵 */
  .service-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  /* 工作方法 */
  .process-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 质量摘要 */
  .quality-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 咨询横幅 */
  .contact-banner {
    padding: 28px 20px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 24px;
  }

  /* 内页面包屑与标题 */
  .breadcrumb {
    padding-top: 12px;
    padding-bottom: 4px;
  }

  .page-header {
    padding-top: 12px;
    padding-bottom: 12px;
    margin-bottom: 24px;
  }

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

  /* 服务内容页 */
  .service-intro-section,
  .service-category-section {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .service-intro-media img,
  .category-media img {
    height: 180px;
  }

  .boundary-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  /* 工作方法页 */
  .method-intro {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .method-figure img {
    height: 180px;
  }

  .process-step {
    grid-template-columns: 56px 1fr;
    gap: 16px;
  }

  .deliverables-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .next-entry-content {
    padding: 28px 20px;
  }

  .entry-links {
    flex-direction: column;
    align-items: center;
  }

  .entry-button,
  .entry-link {
    width: 100%;
    justify-content: center;
  }

  /* 质量标准页 */
  .quality-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .quality-figure img {
    height: 180px;
  }

  .audit-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .confidentiality-list {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  /* 关于页 */
  .about-intro {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .mission-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .expertise-items {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .guide-cards {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* FAQ 页 */
  .content-media-inline img {
    height: 160px;
  }

  .faq-group {
    padding-top: 24px;
    padding-bottom: 24px;
  }

  .contact-entry-inner {
    padding: 28px 20px;
  }

  /* 合作咨询页 */
  .contact-intro-inner {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .contact-intro-media img {
    height: 180px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .checklist-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .related-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

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

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

  .error-actions .btn-primary,
  .error-actions .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}

/* 超小屏：480px 以下 */
@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 24px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .hero-summary {
    font-size: 13px;
  }

  .related-links {
    justify-content: flex-start;
  }

  .related-links-label {
    width: 100%;
    margin-bottom: 4px;
  }

  .process-step {
    grid-template-columns: 44px 1fr;
    gap: 12px;
  }

  .process-step .step-number {
    width: 40px;
    height: 40px;
    font-size: 17px;
  }

  .steps-grid .step-number {
    width: 32px;
    height: 32px;
    font-size: 15px;
  }

  .quality-number {
    font-size: 26px;
  }
}