/* =========================================================
   51黑料网 · 全站样式
   视觉方向：研究报告风 · 深蓝 / 米白 / 橙红
   ========================================================= */

/* =========================================================
   Base
   ========================================================= */
:root {
  --color-primary: #0A2540;
  --color-primary-light: #12355b;
  --color-accent: #FF6B35;
  --color-accent-dark: #e55a2b;
  --color-bg: #FAF7F2;
  --color-surface: #ffffff;
  --color-text: #2D3748;
  --color-text-light: #5a6b7d;
  --color-border: #E2E8F0;
  --color-muted: #f1ede6;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", "Songti SC", SimSun, serif;

  --container-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 3px rgba(10, 37, 64, 0.08);
  --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.1);
  --shadow-lg: 0 12px 28px rgba(10, 37, 64, 0.14);

  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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-accent);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-primary);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1rem;
}

/* =========================================================
   Layout
   ========================================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(10, 37, 64, 0.25);
}

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

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.65);
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.nav-list li a:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-list li a.is-current {
  color: #ffffff;
  background-color: rgba(255, 107, 53, 0.75);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: #ffffff;
}

.site-main {
  padding-top: var(--header-height);
  min-height: calc(100vh - var(--header-height) - 320px);
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

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

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

.breadcrumb-sep {
  color: #b0b8c4;
}

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

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.page-description {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.8;
}

/* =========================================================
   Components
   ========================================================= */
/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: none;
}

.btn:hover {
  transform: translateY(-2px);
}

.primary-btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  background-color: var(--color-accent);
  color: #ffffff;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
  border: none;
}

.primary-btn:hover {
  background-color: var(--color-accent-dark);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.text-link {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

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

/* =========================================================
   Header / Nav
   ========================================================= */
.nav-toggle .icon {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #ffffff;
  position: relative;
  transition: background-color 0.2s;
}

.nav-toggle .icon::before,
.nav-toggle .icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #ffffff;
  transition: transform 0.2s;
}

.nav-toggle .icon::before {
  top: -7px;
}

.nav-toggle .icon::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .icon::after {
  transform: rotate(-45deg);
  top: 0;
}

/* =========================================================
   首页
   ========================================================= */
.home-main {
  padding-top: var(--header-height);
}

/* Hero */
.home-hero {
  background-color: var(--color-primary);
  color: #ffffff;
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
}

.hero-figure {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px;
  width: 100%;
}

.hero-content h1 {
  font-size: 2.6rem;
  font-weight: 800;
  color: #ffffff;
  max-width: 720px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-content .btn {
  background-color: var(--color-accent);
  color: #ffffff;
}

.hero-content .btn:hover {
  background-color: var(--color-accent-dark);
}

/* 三入口 */
.home-entry {
  max-width: var(--container-width);
  margin: -40px auto 0;
  padding: 0 24px;
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.entry-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.entry-card h2 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.entry-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.entry-card a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* 主推荐 */
.home-recommend {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px 0;
}

.home-recommend h2,
.home-sub-recommend h2,
.home-category h2,
.home-updates h2,
.home-process h2,
.home-faq h2,
.home-cta h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

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

.recommend-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

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

.recommend-card h3 {
  padding: 20px 24px 8px;
  font-size: 1.2rem;
}

.recommend-card p {
  padding: 0 24px;
  font-size: 0.95rem;
  color: var(--color-text-light);
}

.recommend-card a {
  display: inline-block;
  margin: 12px 24px 24px;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9rem;
}

/* 次推荐 */
.home-sub-recommend {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

.sub-list {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}

.sub-list li {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.sub-list li:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-accent);
}

.sub-list h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.sub-list p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.sub-list a {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 600;
}

/* 分类导航 */
.home-category {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

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

.category-item {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.category-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-accent);
  color: var(--color-primary);
}

.category-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.category-item p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 最新动态 */
.home-updates {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

.update-list {
  margin-top: 20px;
  display: grid;
  gap: 12px;
}

.update-list li {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 12px;
}

.update-list a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-size: 0.95rem;
  color: var(--color-text);
  transition: color var(--transition);
}

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

.update-date {
  font-size: 0.82rem;
  color: var(--color-text-light);
  flex-shrink: 0;
  font-family: var(--font-serif);
}

.update-topic {
  font-weight: 500;
}

/* 流程预览 */
.home-process {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

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

.process-steps li {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  position: relative;
  counter-increment: step;
}

.process-steps li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.process-steps h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.process-steps p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.home-process .text-link {
  margin-top: 20px;
}

/* 引用 */
.home-quote {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

.home-quote blockquote {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.9);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 32px 36px;
  font-size: 1.05rem;
  line-height: 1.9;
  font-family: var(--font-serif);
  position: relative;
}

/* FAQ 摘要 */
.home-faq {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 0;
}

.home-faq details {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.home-faq summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  position: relative;
  color: var(--color-primary);
  list-style: none;
  transition: color var(--transition);
}

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

.home-faq summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

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

.home-faq details p {
  padding: 0 24px 18px;
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin: 0;
}

.home-faq .text-link {
  margin-top: 16px;
}

/* CTA */
.home-cta {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 72px 24px;
  text-align: center;
}

.home-cta h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.home-cta p {
  max-width: 560px;
  margin: 0 auto 28px;
  color: var(--color-text-light);
}

.home-cta .btn {
  background-color: var(--color-accent);
  color: #ffffff;
}

.home-cta .btn:hover {
  background-color: var(--color-accent-dark);
}

/* =========================================================
   内页通用
   ========================================================= */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* =========================================================
   服务能力页
   ========================================================= */
.service-matrix {
  margin-bottom: 56px;
}

.service-matrix > p,
.core-services > p,
.service-scenarios > p {
  color: var(--color-text-light);
  margin-bottom: 20px;
}

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

.matrix-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1.2fr;
  border-bottom: 1px solid var(--color-border);
}

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

.matrix-header {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
}

.matrix-header span {
  color: #ffffff;
}

.matrix-row span {
  padding: 14px 18px;
  font-size: 0.92rem;
  line-height: 1.6;
}

.matrix-row:not(.matrix-header) span:first-child {
  font-weight: 600;
  color: var(--color-primary);
}

.matrix-row:nth-child(even) {
  background-color: var(--color-muted);
}

/* 核心服务 */
.core-services {
  margin-bottom: 56px;
}

.service-block {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 40px;
  padding: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.service-block:nth-child(even) {
  direction: rtl;
}

.service-block:nth-child(even) > * {
  direction: ltr;
}

.service-copy h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.service-copy p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.service-copy a {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.9rem;
}

.service-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

/* 适用场景 */
.service-scenarios {
  margin-bottom: 32px;
}

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

.scenario-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
}

.scenario-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.scenario-item p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.service-scenarios > p:last-child {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.service-scenarios > p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* =========================================================
   交付流程页
   ========================================================= */
.process-timeline {
  margin-bottom: 56px;
}

.process-timeline > p,
.deliverables > p,
.communication > p {
  color: var(--color-text-light);
}

.timeline-list {
  position: relative;
  padding-left: 32px;
  margin-top: 32px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
  padding: 24px 28px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 32px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-content h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 交付标准 */
.deliverables {
  margin-bottom: 56px;
}

.deliverables-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

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

.deliverable-card h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.deliverable-card ul li {
  font-size: 0.88rem;
  color: var(--color-text-light);
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}

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

.process-figure {
  margin-top: 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.process-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.process-figure figcaption {
  background-color: var(--color-surface);
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* 沟通机制 */
.communication {
  margin-bottom: 40px;
}

.communication p {
  max-width: 800px;
}

/* 相关链接 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 20px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.related-links-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

.related-links-item {
  font-size: 0.9rem;
  color: var(--color-accent);
  font-weight: 500;
}

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

/* =========================================================
   专业团队页
   ========================================================= */
.team-framework {
  margin-bottom: 56px;
}

.team-framework > p,
.team-specialties > p {
  color: var(--color-text-light);
}

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

.framework-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  border-top: 3px solid var(--color-accent);
}

.framework-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.framework-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 专业分工 */
.team-specialties {
  margin-bottom: 56px;
}

.specialty-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

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

.specialty-item h3 {
  font-size: 1rem;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.specialty-item p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 协作方式 */
.team-collab {
  margin-bottom: 32px;
}

.collab-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 24px;
}

.collab-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.collab-text p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

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

/* =========================================================
   合作联系页
   ========================================================= */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 1.35rem;
  margin-bottom: 6px;
}

.section-heading p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.contact-flow-section {
  margin-bottom: 56px;
}

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

.flow-step-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  counter-increment: flow-step;
}

.flow-step-card::before {
  content: counter(flow-step, decimal-leading-zero);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.contact-flow-grid {
  counter-reset: flow-step;
}

.flow-step-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.flow-step-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 需求准备清单 */
.checklist-section {
  margin-bottom: 56px;
}

.checklist-wrapper {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.checklist-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.checklist-list h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.checklist-list p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.checklist-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.checklist-figure figcaption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--color-text-light);
  background-color: var(--color-muted);
}

/* FAQ 入口 */
.faq-entry-section {
  margin-bottom: 48px;
}

.faq-entry-section .section-heading p a {
  color: var(--color-accent);
  font-weight: 600;
}

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

.faq-entry-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.faq-entry-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.faq-entry-item p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.faq-entry-more {
  margin-top: 24px;
}

/* 相关服务入口 */
.related-links-section {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.related-links-section p {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 0;
}

.related-links-section a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.92rem;
}

/* =========================================================
   常见问题页
   ========================================================= */
.faq-section {
  margin-bottom: 48px;
}

.faq-section h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

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

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

.faq-item summary {
  padding: 18px 24px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  position: relative;
  color: var(--color-primary);
  list-style: none;
  transition: color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 24px;
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

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

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--color-text-light);
}

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

.faq-answer a {
  color: var(--color-accent);
  font-weight: 500;
}

.faq-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 48px;
}

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

.faq-media figcaption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--color-text-light);
  background-color: var(--color-muted);
}

/* 支持入口 */
.faq-support {
  padding: 32px;
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  color: #ffffff;
}

.faq-support h2 {
  color: #ffffff;
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.faq-support p {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 0;
}

.faq-support a {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.faq-support a:hover {
  color: #ffffff;
}

/* =========================================================
   404 页
   ========================================================= */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 320px);
  padding: 64px 24px;
}

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

.error-code {
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-accent);
  font-family: var(--font-serif);
  line-height: 1.2;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.error-content p {
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.btn-return {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: background-color var(--transition), transform var(--transition);
}

.btn-return:hover {
  background-color: var(--color-accent-dark);
  color: #ffffff;
  transform: translateY(-2px);
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.75);
  padding: 56px 24px 24px;
  margin-top: 0;
}

.site-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.footer-column h3 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 600;
}

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

.footer-column ul li a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 20px;
  margin-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 0;
}

/* =========================================================
   移动端底部导航
   ========================================================= */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background-color: var(--color-primary);
  box-shadow: 0 -2px 8px rgba(10, 37, 64, 0.2);
  padding: 6px 12px calc(6px + env(safe-area-inset-bottom));
}

.mobile-bottom-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 4px;
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-sm);
  min-height: 44px;
  justify-content: center;
}

.mobile-bottom-nav a.current {
  color: var(--color-accent);
  font-weight: 600;
}

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .brand-slogan {
    font-size: 0.65rem;
  }

  .nav-toggle {
    display: block;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    box-shadow: 0 8px 16px rgba(10, 37, 64, 0.3);
    gap: 4px;
  }

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

  .nav-list li a {
    padding: 12px 16px;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .home-hero {
    min-height: 360px;
  }

  .hero-content {
    padding: 48px 16px;
  }

  .hero-content h1 {
    font-size: 1.7rem;
  }

  .hero-sub {
    font-size: 0.95rem;
  }

  .home-entry {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-top: -24px;
    padding: 0 16px;
  }

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

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

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

  .service-block:nth-child(even) {
    direction: ltr;
  }

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

  .timeline-list {
    padding-left: 24px;
  }

  .timeline-marker {
    left: -24px;
  }

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

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

  .specialty-list {
    grid-template-columns: 1fr;
  }

  .collab-layout {
    grid-template-columns: 1fr;
  }

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

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

  .site-footer {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px 80px;
  }

  .footer-bottom {
    grid-column: 1;
  }

  .mobile-bottom-nav {
    display: flex;
  }

  .site-main {
    padding-bottom: 64px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

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

  .contact-flow-grid {
    grid-template-columns: 1fr;
  }

  .matrix-row {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 8px 0;
  }

  .matrix-header {
    display: none;
  }

  .matrix-row span {
    padding: 6px 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .matrix-row span:last-child {
    border-bottom: none;
  }

  .matrix-row span:first-child {
    font-weight: 700;
    color: var(--color-primary);
    background-color: var(--color-muted);
  }

  .home-quote blockquote {
    padding: 24px;
    font-size: 0.95rem;
  }

  .hero-content .btn,
  .home-cta .btn {
    padding: 10px 22px;
    font-size: 0.95rem;
  }

  .related-links-section p {
    flex-direction: column;
    gap: 12px;
  }

  .faq-support p {
    flex-direction: column;
    gap: 12px;
  }
}

/* =========================================================
   动画增强（不影响初始可见性）
   ========================================================= */
@media (prefers-reduced-motion: no-preference) {
  .entry-card,
  .recommend-card,
  .category-item,
  .process-steps li,
  .timeline-item,
  .deliverable-card,
  .framework-card,
  .specialty-item,
  .flow-step-card,
  .faq-entry-item {
    animation: fadeInUp 0.5s ease both;
  }

  .entry-card:nth-child(2),
  .recommend-card:nth-child(2),
  .category-item:nth-child(2),
  .process-steps li:nth-child(2),
  .timeline-item:nth-child(2),
  .deliverable-card:nth-child(2),
  .framework-card:nth-child(2),
  .specialty-item:nth-child(2),
  .flow-step-card:nth-child(2) {
    animation-delay: 0.08s;
  }

  .entry-card:nth-child(3),
  .category-item:nth-child(3),
  .process-steps li:nth-child(3),
  .timeline-item:nth-child(3),
  .deliverable-card:nth-child(3),
  .framework-card:nth-child(3),
  .specialty-item:nth-child(3),
  .flow-step-card:nth-child(3) {
    animation-delay: 0.16s;
  }

  .category-item:nth-child(4),
  .process-steps li:nth-child(4),
  .timeline-item:nth-child(4),
  .deliverable-card:nth-child(4),
  .specialty-item:nth-child(4),
  .flow-step-card:nth-child(4) {
    animation-delay: 0.24s;
  }

  .timeline-item:nth-child(5),
  .deliverable-card:nth-child(5) {
    animation-delay: 0.32s;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(16px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

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