/* ==========================================================================
   milk-mania.cn — 51cg吃瓜网 全站样式表
   复古计算机风 + 现代数据报告
   ========================================================================== */

/* ==========================================================================
   Base — 变量、重置、全局基础
   ========================================================================== */

:root {
  --color-bg: #1a1a2e;
  --color-bg-card: #222244;
  --color-bg-light: #f2f2f0;
  --color-accent: #33ff99;
  --color-accent-secondary: #ffcc00;
  --color-text: #f2f2f0;
  --color-text-muted: #b8b8c8;
  --color-border: #e6e6e6;
  --color-dark-border: #3a3a5c;
  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Courier New", Consolas, monospace;
  --container-width: 1200px;
  --radius: 8px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

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

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 700;
}

/* ==========================================================================
   Layout — 容器、页头、页脚、主区域
   ========================================================================== */

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 16px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

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

.brand-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
}

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

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

.nav-list li {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border: 1px solid transparent;
  border-radius: var(--radius);
}

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

.nav-link.is-current {
  color: var(--color-accent);
  border-color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 14px;
}

.theme-toggle {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  color: var(--color-accent);
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 16px;
  flex-shrink: 0;
  transition: border-color var(--transition), color var(--transition);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  color: var(--color-accent);
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 18px;
  flex-shrink: 0;
}

.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.home-main {
  padding-bottom: 60px;
}

.inner-main {
  padding-top: 32px;
  padding-bottom: 60px;
}

.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-dark-border);
  margin-top: 40px;
}

.footer-top {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.footer-intro p:not(.footer-brand) {
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 360px;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-text-muted);
}

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

.footer-feedback p:not(.footer-label) {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.footer-feedback a {
  font-family: var(--font-mono);
  font-size: 14px;
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.footer-bottom {
  border-top: 1px solid var(--color-dark-border);
  padding: 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Components — 通用组件
   ========================================================================== */

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 24px;
  color: var(--color-text-muted);
}

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 12px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
}

.page-title-area,
.page-title-block {
  margin-bottom: 40px;
}

.page-title-code,
.page-code,
.page-code-label,
.page-title-note {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.page-title-desc,
.page-title-note {
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  max-width: 720px;
  font-size: 15px;
  line-height: 1.7;
}

/* 区块标题 */
.section-heading {
  margin-bottom: 32px;
}

.section-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-heading h2,
.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-heading > p:last-child,
.section-intro {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 720px;
}

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 14px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

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

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

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

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

/* 文本链接 */
.text-link {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  display: inline-block;
  margin-top: 12px;
}

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

/* 相关内容导航 */
.related-links {
  margin-top: 48px;
  padding: 24px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 6px 12px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

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

/* FAQ 手风琴 */
.faq-item {
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--color-bg-card);
}

.faq-item summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--color-text);
  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;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 20px;
}

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

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

.faq-item p a {
  color: var(--color-accent);
}

/* CTA 横幅 */
.cta-banner {
  margin-top: 48px;
  padding: 40px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  background: var(--color-bg-card);
  text-align: center;
}

.cta-banner h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.cta-banner p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   Components — 首页专属
   ========================================================================== */

/* Hero */
.hero-section {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0 48px;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.hero-content h1 {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.7;
}

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

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

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

/* 数据指标带 */
.metrics-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}

.metric-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 24px;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--color-accent);
  margin-bottom: 8px;
  display: block;
}

.metric-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 首页服务预览 */
.services-preview,
.industries-preview,
.process-preview,
.cases-preview,
.faq-section {
  margin-bottom: 64px;
}

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

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.service-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

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

.service-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.service-card a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
}

/* 首页行业预览 */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.industry-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition);
}

.industry-card:hover {
  border-color: var(--color-accent-secondary);
  transform: translateY(-2px);
}

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

.industry-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.industry-card a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
}

/* 首页流程时间轴 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.process-steps li {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.process-steps h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.process-steps p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.section-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  margin-top: 16px;
}

/* 首页案例 */
.case-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.case-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 24px;
}

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

.case-item p {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.6;
}

.case-item a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
}

/* 首页 CTA */
.cta-content {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.cta-content h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.cta-content p {
  font-size: 15px;
  margin-bottom: 24px;
}

/* ==========================================================================
   Pages — 业务范围 services.html
   ========================================================================== */

.service-nav {
  margin-bottom: 40px;
}

.service-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.service-nav-list a {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 8px 16px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.service-nav-list a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.service-block {
  margin-bottom: 48px;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.service-block-head {
  margin-bottom: 24px;
}

.service-level {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.service-block-head h2 {
  font-size: 24px;
  color: var(--color-text);
}

.service-block-body {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: start;
}

.service-target {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent-secondary);
  margin-bottom: 12px;
}

.service-block-text p:not(.service-target) {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.7;
}

.deliverable {
  margin-top: 16px;
  padding: 16px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.deliverable-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.deliverable-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

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

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

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

.service-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

/* 服务边界 */
.service-boundary {
  margin-bottom: 48px;
  padding: 32px;
  border: 1px solid var(--color-accent-secondary);
  border-radius: var(--radius);
  background: var(--color-bg-card);
}

.service-boundary h2 {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.service-boundary > p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.boundary-list li {
  font-size: 14px;
  color: var(--color-text-muted);
  padding-left: 20px;
  position: relative;
}

.boundary-list li::before {
  content: "×";
  position: absolute;
  left: 0;
  color: var(--color-accent-secondary);
  font-family: var(--font-mono);
}

.boundary-note {
  font-size: 14px;
  color: var(--color-text-muted);
  font-style: italic;
}

.service-cta {
  text-align: center;
  padding: 32px;
  margin-bottom: 48px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
}

.service-cta p {
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.service-cta a {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  padding: 10px 24px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  display: inline-block;
}

/* ==========================================================================
   Pages — 行业场景 industries.html
   ========================================================================== */

.industry-card-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.industry-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.industry-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  background: var(--color-bg);
  padding: 4px 8px;
  border-radius: 4px;
}

.industry-name {
  font-size: 18px;
  color: var(--color-text);
}

.comparison-table-wrap {
  margin-bottom: 48px;
}

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

.dimension-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 14px;
}

.dimension-table th,
.dimension-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-dark-border);
}

.dimension-table thead th {
  background: var(--color-bg-card);
  color: var(--color-accent);
  font-weight: 700;
}

.dimension-table tbody th {
  color: var(--color-text);
  font-weight: 600;
}

.dimension-table tbody td {
  color: var(--color-text-muted);
}

.dimension-table tbody tr:last-child th,
.dimension-table tbody tr:last-child td {
  border-bottom: none;
}

.analysis-note-item {
  margin-bottom: 24px;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.analysis-note-item h3 {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.analysis-note-item p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.industry-media {
  margin-top: 48px;
}

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

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

.media-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

/* ==========================================================================
   Pages — 交付流程 process.html
   ========================================================================== */

.process-timeline {
  margin-bottom: 48px;
}

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

.timeline-list::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-dark-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timeline-step {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-bg);
  position: relative;
  z-index: 1;
}

.timeline-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  margin-top: 4px;
  writing-mode: vertical-rl;
}

.timeline-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.timeline-content h3 {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.deliverables-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

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

.deliverable-card h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}

.deliverable-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.deliverable-card li {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.check-mark {
  font-family: var(--font-mono);
  color: var(--color-accent);
  flex-shrink: 0;
}

.process-figure {
  margin-bottom: 48px;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.process-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

.cta-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  padding: 10px 24px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
}

/* ==========================================================================
   Pages — 案例观察 cases.html
   ========================================================================== */

.filter-tabs {
  margin-bottom: 32px;
}

.filter-tab-list {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.filter-tab {
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 10px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-tab:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-tab.is-active {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.case-list-section {
  margin-bottom: 48px;
}

.case-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  overflow: hidden;
}

.case-card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-dark-border);
}

.case-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.case-title {
  font-size: 20px;
  color: var(--color-text);
}

.case-card-body {
  padding: 24px;
}

.case-question,
.case-method,
.case-observation,
.case-insight {
  margin-bottom: 20px;
}

.case-card-body h4 {
  font-size: 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.case-card-body p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.case-figure {
  margin: 20px 0;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.case-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background: var(--color-bg);
}

.method-summary-content p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}

.cta-banner-inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.cta-label {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.cta-banner-inner p:not(.cta-label) {
  font-size: 15px;
  margin-bottom: 24px;
}

.cta-button {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-accent);
  padding: 10px 24px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
}

/* ==========================================================================
   Pages — 联系 contact.html
   ========================================================================== */

.section-block {
  margin-bottom: 48px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.process-step-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  padding: 20px;
}

.step-number {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}

.process-step-item h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.process-step-item p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.process-more-link {
  font-size: 14px;
}

.process-more-link a {
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.checklist-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.checklist-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.checklist-marker {
  font-family: var(--font-mono);
  color: var(--color-accent);
  flex-shrink: 0;
}

.feedback-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  align-items: center;
}

.feedback-image {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius);
}

.feedback-text p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
  line-height: 1.7;
}

.faq-accordion {
  margin-top: 24px;
}

/* ==========================================================================
   Pages — 404
   ========================================================================== */

.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-section {
  text-align: center;
  padding: 48px 24px;
  max-width: 560px;
}

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

.error-section h1 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

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

.error-tip {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive — 响应式
   ========================================================================== */

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

  .brand-tag {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .theme-toggle {
    width: 44px;
    height: 44px;
  }

  .main-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-dark-border);
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    z-index: 99;
  }

  .main-nav.is-open {
    max-height: 480px;
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    padding: 16px;
    gap: 4px;
  }

  .nav-link {
    display: block;
    padding: 12px 14px;
    font-size: 16px;
    border-radius: var(--radius);
  }

  .nav-link.is-current {
    background: var(--color-bg-card);
  }

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

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

  /* Hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0 32px;
  }

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

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

  /* 指标带 */
  .metrics-band {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 40px;
  }

  /* 服务网格 */
  .service-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 行业网格 */
  .industry-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

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

  /* 案例 */
  .case-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* CTA */
  .cta-banner {
    padding: 24px;
  }

  /* 页脚 */
  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  /* 服务页 */
  .service-block {
    padding: 20px;
  }

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

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

  .service-nav-list {
    gap: 8px;
  }

  .service-nav-list a {
    padding: 8px 12px;
    font-size: 13px;
  }

  /* 行业页 */
  .dimension-table {
    font-size: 13px;
    min-width: 560px;
  }

  .analysis-note-item {
    padding: 20px;
  }

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

  /* 流程页 */
  .timeline-list {
    padding-left: 24px;
  }

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

  .timeline-content {
    padding: 16px;
  }

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

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

  /* 案例页 */
  .case-card-body {
    padding: 16px;
  }

  .case-card-header {
    padding: 16px;
  }

  .case-figure img {
    height: 160px;
  }

  .filter-tab-list {
    gap: 8px;
  }

  .filter-tab {
    padding: 8px 14px;
    font-size: 13px;
  }

  /* 联系页 */
  .feedback-content {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feedback-image {
    height: 180px;
  }

  .checklist-list li {
    padding: 14px 16px;
  }

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

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

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

  /* 相关内容 */
  .related-links {
    padding: 16px;
    gap: 12px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .deliverables-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-section {
    gap: 32px;
  }

  .hero-content h1 {
    font-size: 34px;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block;
  }
}

/* ==========================================================================
   主题切换 — 亮色模式
   ========================================================================== */

body.site-body.light-theme {
  --color-bg: #f2f2f0;
  --color-bg-card: #ffffff;
  --color-bg-light: #1a1a2e;
  --color-text: #1a1a2e;
  --color-text-muted: #555577;
  --color-border: #d0d0d8;
  --color-dark-border: #c8c8d0;
}

body.site-body.light-theme .site-header,
body.site-body.light-theme .site-footer {
  background: #f2f2f0;
  border-color: #c8c8d0;
}

body.site-body.light-theme .nav-link {
  color: #1a1a2e;
}

body.site-body.light-theme .nav-link.is-current {
  color: #1a1a2e;
  border-color: #1a1a2e;
}

body.site-body.light-theme .theme-toggle,
body.site-body.light-theme .nav-toggle {
  background: #ffffff;
  border-color: #c8c8d0;
  color: #1a1a2e;
}

body.site-body.light-theme .metric-card,
body.site-body.light-theme .service-card,
body.site-body.light-theme .industry-card,
body.site-body.light-theme .process-steps li,
body.site-body.light-theme .case-item,
body.site-body.light-theme .service-block,
body.site-body.light-theme .analysis-note-item,
body.site-body.light-theme .timeline-content,
body.site-body.light-theme .deliverable-card,
body.site-body.light-theme .case-card,
body.site-body.light-theme .process-step-item,
body.site-body.light-theme .checklist-list li,
body.site-body.light-theme .faq-item,
body.site-body.light-theme .cta-banner,
body.site-body.light-theme .service-boundary,
body.site-body.light-theme .service-cta,
body.site-body.light-theme .deliverable {
  background: #ffffff;
  border-color: #c8c8d0;
}

body.site-body.light-theme .dimension-table thead th {
  background: #ffffff;
}

body.site-body.light-theme .dimension-table th,
body.site-body.light-theme .dimension-table td {
  border-color: #c8c8d0;
}

body.site-body.light-theme .service-figure figcaption,
body.site-body.light-theme .media-figure figcaption,
body.site-body.light-theme .process-figure figcaption,
body.site-body.light-theme .case-figure figcaption {
  background: #f2f2f0;
}

body.site-body.light-theme .industry-code {
  background: #f2f2f0;
}

body.site-body.light-theme .main-nav {
  background: #f2f2f0;
  border-color: #c8c8d0;
}

@media (max-width: 768px) {
  body.site-body.light-theme .main-nav {
    background: #f2f2f0;
  }
}