/* ============================================================
   51黑料吃瓜 - 全站样式表
   视觉方向：命令行工具风 · 等宽标题 · 中性底色 · 绿色高亮
   ============================================================ */

/* ============================================================
   Base · 基础变量与重置
   ============================================================ */
:root {
  --color-ink: #1e1e1e;
  --color-paper: #f5f5f0;
  --color-paper-deep: #ecece4;
  --color-panel: #ffffff;
  --color-accent: #4caf50;
  --color-accent-dark: #2e7d32;
  --color-warn: #ff9800;
  --color-muted: #9e9e9e;
  --color-border: #d8d8cf;
  --color-terminal-bg: #1e1e1e;
  --color-terminal-text: #c8c8c0;
  --color-terminal-prompt: #4caf50;
  --font-mono: "Courier New", Consolas, "SF Mono", monospace;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --radius: 6px;
  --radius-sm: 4px;
  --space-section: 64px;
  --space-block: 32px;
  --header-h: 64px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

/* ============================================================
   Layout · 全站骨架（页头 / 页脚 / 主容器 / 面包屑）
   ============================================================ */

.site-header {
  background-color: var(--color-ink);
  border-bottom: 3px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  color: var(--color-paper);
  flex-shrink: 0;
}

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

.brand-name {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-name::before {
  content: "$ ";
  color: var(--color-accent);
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
}

.main-nav.site-nav ul {
  display: flex;
  gap: 4px;
}

.main-nav.site-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--color-paper);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.main-nav.site-nav a:hover {
  color: var(--color-accent);
  border-color: rgba(76, 175, 80, 0.4);
}

.main-nav.site-nav a.is-current {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: rgba(76, 175, 80, 0.08);
}

/* 外链标识（预留，当前导航不使用） */
.main-nav.site-nav a[target="_blank"]::after {
  content: " ↗";
  color: var(--color-warn);
  font-size: 12px;
}

/* 站点提示条 */
.site-notice {
  background-color: #2b2b2b;
  color: var(--color-muted);
  font-size: 13px;
  border-bottom: 1px solid #3a3a3a;
}

.site-notice p {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 8px 24px;
  font-family: var(--font-mono);
}

.site-notice p::before {
  content: "// ";
  color: var(--color-accent);
}

/* 主容器 */
.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.home-main {
  padding-top: 0;
}

.inner-main {
  padding-top: 24px;
  padding-bottom: 56px;
}

/* 面包屑 */
.breadcrumb {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-muted);
  padding: 12px 0 8px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}

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

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

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

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 700;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 20px;
}

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

.page-title::before {
  content: "$ ";
  color: var(--color-accent);
}

.page-title-area {
  margin-bottom: var(--space-block);
  font-size: 16px;
  color: #555;
  max-width: 780px;
}

.page-lead,
.page-intro,
.page-title-desc {
  max-width: 720px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: var(--color-paper);
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h3 {
  color: var(--color-accent);
  font-size: 14px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.footer-col h3::before {
  content: "# ";
}

.footer-col ul li {
  margin-bottom: 6px;
}

.footer-col a {
  color: #aaa;
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid #333;
  padding: 16px 24px;
  text-align: center;
  color: var(--color-muted);
  font-size: 13px;
  font-family: var(--font-mono);
}

/* ============================================================
   Components · 通用组件
   ============================================================ */

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 10px 22px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}

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

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

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

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

/* 区块标题 */
.section-heading {
  margin-bottom: 28px;
}

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

.section-heading h2::before {
  content: "// ";
  color: var(--color-accent);
}

.section-heading p {
  color: #666;
  max-width: 640px;
}

/* 终端面板 */
.terminal-panel {
  background-color: var(--color-terminal-bg);
  border-radius: var(--radius);
  border: 1px solid #333;
  overflow: hidden;
  font-family: var(--font-mono);
}

.terminal-header {
  background-color: #2b2b2b;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #3a3a3a;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-muted);
  display: inline-block;
}

.terminal-dot:nth-child(1) {
  background-color: #f44336;
}

.terminal-dot:nth-child(2) {
  background-color: var(--color-warn);
}

.terminal-dot:nth-child(3) {
  background-color: var(--color-accent);
}

.terminal-title {
  margin-left: 8px;
  font-size: 13px;
  color: #aaa;
}

.terminal-body {
  padding: 20px 24px;
  color: var(--color-terminal-text);
  font-size: 14px;
  line-height: 1.8;
}

.terminal-body h2 {
  color: var(--color-accent);
  font-size: 16px;
  margin-bottom: 12px;
}

.terminal-body p {
  margin-bottom: 8px;
}

.terminal-line {
  display: block;
  word-break: break-all;
}

.terminal-line .prompt {
  color: var(--color-terminal-prompt);
  margin-right: 6px;
  user-select: none;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent-dark);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 2px;
}

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

.text-link::after {
  content: " →";
}

/* 相关链接 */
.related-links {
  margin-top: 40px;
  padding: 16px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  font-weight: 700;
}

.related-links-label::before {
  content: "// ";
  color: var(--color-accent);
}

.related-links-item {
  font-size: 14px;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background-color: var(--color-panel);
}

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

/* 帮助面板 */
.help-panel {
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  align-self: start;
}

.help-panel-inner {
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

.help-panel h2,
.help-title {
  font-size: 16px;
  margin-bottom: 12px;
}

.help-panel h2::before,
.help-title::before {
  content: "$ help ";
  color: var(--color-accent);
}

.help-intro {
  font-size: 13px;
  color: #666;
  margin-bottom: 16px;
}

.help-panel ul,
.help-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.help-panel li a,
.help-links li a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  border-left: 2px solid var(--color-accent);
  background-color: rgba(76, 175, 80, 0.04);
  color: var(--color-ink);
}

.help-panel li a:hover,
.help-links li a:hover {
  background-color: rgba(76, 175, 80, 0.1);
  color: var(--color-accent-dark);
}

/* 图片容器 */
figure {
  margin: 0;
}

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

figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding-top: 8px;
  font-style: italic;
  line-height: 1.5;
}

/* ============================================================
   Pages · 首页
   ============================================================ */

/* 首屏 hero */
.hero-section {
  padding: 48px 0 40px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 34px;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-copy h1::before {
  content: "$ ";
  color: var(--color-accent);
}

.hero-lead {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--color-accent-dark);
  margin-bottom: 12px;
  font-weight: 700;
}

.hero-desc {
  color: #555;
  margin-bottom: 24px;
  max-width: 480px;
}

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

.hero-visual {
  position: relative;
}

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

.hero-figure img {
  aspect-ratio: 4 / 3;
}

.content-media-primary {
  margin-top: 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.content-media-primary img {
  aspect-ratio: 16 / 5;
}

.content-media-primary figcaption {
  padding: 10px 16px;
  background-color: var(--color-panel);
}

/* 服务对比选择器 */
.selector-section {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

.selector-panel {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.selector-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.selector-option {
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 14px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  color: var(--color-ink);
}

.selector-option:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

.selector-option.is-active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.selector-output {
  background-color: var(--color-terminal-bg);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  min-height: 80px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-terminal-text);
  line-height: 1.7;
}

.output-placeholder {
  color: var(--color-muted);
}

.output-placeholder::before {
  content: "$ ";
  color: var(--color-accent);
}

/* 核心能力摘要 */
.capability-section {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

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

.capability-item {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  border-top: 3px solid var(--color-accent);
}

.capability-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.capability-item h3::before {
  content: "> ";
  color: var(--color-accent);
}

.capability-summary {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-dark);
  margin-bottom: 10px;
  font-weight: 700;
}

.capability-detail {
  color: #555;
  font-size: 14px;
  margin-bottom: 12px;
}

.capability-scene {
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px dashed var(--color-border);
  padding-top: 10px;
}

.capability-scene::before {
  content: "适用：";
  font-weight: 700;
  color: #777;
}

/* 服务矩阵预览 */
.services-preview {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

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

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

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.service-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.service-card h3::before {
  content: "#";
  color: var(--color-accent);
  margin-right: 4px;
}

.service-card p {
  font-size: 14px;
  color: #666;
  flex-grow: 1;
  margin-bottom: 12px;
}

.service-card a {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent-dark);
}

.service-card a::after {
  content: " →";
}

/* 研究摘要 */
.research-section {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

/* 合作流程预览 */
.process-preview {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

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

.process-step {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
}

.process-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-ink);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.process-step h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 13px;
  color: #666;
}

/* 常见问题入口 */
.faq-entry {
  padding: var(--space-section) 0;
  border-top: 1px solid var(--color-border);
}

.faq-entry-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 720px;
}

.faq-entry-list li a {
  display: block;
  padding: 14px 18px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-ink);
  transition: background-color var(--transition);
}

.faq-entry-list li a:hover {
  background-color: rgba(76, 175, 80, 0.06);
  color: var(--color-accent-dark);
}

.faq-entry-list li a::before {
  content: "? ";
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

/* ============================================================
   Pages · 服务项目（services）
   ============================================================ */

.layout-shell {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 40px;
}

.layout-shell .main-content {
  min-width: 0;
  min-width: 520px;
}

.page-banner {
  margin-bottom: 24px;
}

.banner-inner {
  background-color: var(--color-terminal-bg);
  border-radius: var(--radius);
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-terminal-text);
  line-height: 1.6;
}

.banner-inner::before {
  content: "$ banner --mode=services\n";
  color: var(--color-accent);
  white-space: pre;
}

/* 服务矩阵 */
.services-matrix {
  margin-bottom: 48px;
}

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-title::before {
  content: "// ";
  color: var(--color-accent);
}

.section-intro {
  color: #666;
  margin-bottom: 24px;
  max-width: 640px;
}

.service-card {
  margin-bottom: 20px;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.service-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background-color: var(--color-paper-deep);
  border-bottom: 1px solid var(--color-border);
}

.service-index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-ink);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

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

.service-card-body {
  padding: 20px;
}

.service-summary {
  font-size: 15px;
  color: #555;
  margin-bottom: 16px;
}

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

.service-detail-item {
  background-color: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 13px;
}

.service-detail-item strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent-dark);
  margin-bottom: 4px;
  text-transform: uppercase;
}

/* 服务能力对比 */
.service-comparison {
  margin-bottom: 48px;
}

.comparison-table-wrap {
  overflow-x: auto;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 600px;
}

.comparison-table th,
.comparison-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  font-family: var(--font-mono);
  font-size: 13px;
  background-color: var(--color-paper-deep);
  color: var(--color-ink);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:hover {
  background-color: rgba(76, 175, 80, 0.04);
}

.support-full::before,
.support-partial::before,
.support-none::before {
  font-family: var(--font-mono);
  font-weight: 700;
}

.support-full::before {
  content: "●";
  color: var(--color-accent);
}

.support-partial::before {
  content: "◐";
  color: var(--color-warn);
}

.support-none::before {
  content: "○";
  color: var(--color-muted);
}

/* 服务场景 */
.service-scene {
  margin-bottom: 48px;
}

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

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

.scene-figure img {
  aspect-ratio: 4 / 3;
}

.scene-figure figcaption {
  padding: 10px 14px;
  background-color: var(--color-panel);
}

/* ============================================================
   Pages · 行业方案（industries）
   ============================================================ */

.industry-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 48px;
}

.industry-intro-copy h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.industry-intro-copy h2::before {
  content: "// ";
  color: var(--color-accent);
}

.industry-intro-copy p {
  color: #555;
}

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

.industry-intro-media img {
  aspect-ratio: 16 / 10;
}

.industry-problems,
.industry-strategies,
.industry-approach,
.industry-results {
  margin-bottom: 48px;
}

.industry-problems h2,
.industry-strategies h2,
.industry-approach h2,
.industry-results h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.industry-problems h2::before,
.industry-strategies h2::before,
.industry-approach h2::before,
.industry-results h2::before {
  content: "// ";
  color: var(--color-accent);
}

.industry-problems > p,
.industry-strategies > p,
.industry-approach > p,
.industry-results > p {
  color: #666;
  margin-bottom: 20px;
  max-width: 640px;
}

.problem-card,
.strategy-block {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
}

.problem-card h3,
.strategy-block h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

.problem-card h3::before,
.strategy-block h3::before {
  content: "> ";
  color: var(--color-warn);
}

.problem-card p,
.strategy-block p {
  font-size: 14px;
  color: #555;
  margin-bottom: 8px;
}

.problem-card strong,
.strategy-block strong {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent-dark);
}

.approach-steps {
  counter-reset: approach;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.approach-steps li {
  counter-increment: approach;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 14px;
  color: #555;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.approach-steps li::before {
  content: counter(approach, decimal-leading-zero);
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

.approach-steps li span {
  font-weight: 700;
  color: var(--color-ink);
  margin-right: 8px;
}

.results-media {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
}

.results-media img {
  aspect-ratio: 16 / 6;
}

.industry-results > p:last-of-type a {
  display: inline-block;
  margin-right: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.industry-results > p:last-of-type a::after {
  content: " →";
}

/* ============================================================
   Pages · 研究方法（methods）
   ============================================================ */

.methods-content {
  max-width: 860px;
}

.research-summary {
  margin-bottom: 48px;
}

.research-summary .terminal-body h2 {
  font-size: 18px;
}

.research-figure {
  margin-top: 16px;
  border: 1px solid #3a3a3a;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.research-figure img {
  aspect-ratio: 16 / 8;
}

.method-steps,
.progress-record,
.public-results {
  margin-bottom: 48px;
}

.method-steps h2,
.progress-record h2,
.public-results h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.method-steps h2::before,
.progress-record h2::before,
.public-results h2::before {
  content: "// ";
  color: var(--color-accent);
}

.method-lead,
.progress-lead,
.results-lead {
  color: #666;
  margin-bottom: 24px;
  max-width: 640px;
}

.method-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.method-step {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.method-step-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.method-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  background-color: var(--color-ink);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.method-step h3 {
  font-size: 16px;
}

.method-step > p {
  font-size: 14px;
  color: #555;
}

.progress-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.progress-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 16px;
  padding-bottom: 24px;
  position: relative;
}

.progress-item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 24px;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.progress-item:last-child::before {
  display: none;
}

.progress-marker {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-accent);
  border: 3px solid var(--color-paper);
  box-shadow: 0 0 0 2px var(--color-accent);
  z-index: 1;
}

.progress-content {
  padding-top: 2px;
}

.progress-content h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.progress-content p {
  font-size: 14px;
  color: #555;
}

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

.result-card {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.result-figure {
  border-bottom: 1px solid var(--color-border);
}

.result-figure img {
  aspect-ratio: 16 / 9;
}

.result-content {
  padding: 16px 20px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.result-content h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.result-content p {
  font-size: 14px;
  color: #555;
  flex-grow: 1;
  margin-bottom: 12px;
}

.result-content a {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent-dark);
}

.result-content a::after {
  content: " →";
}

/* ============================================================
   Pages · 答疑中心（faq）
   ============================================================ */

.page-layout {
  max-width: var(--container-width);
  margin: 0 auto;
}

.page-title-block {
  font-size: 15px;
  color: #666;
  margin-bottom: 24px;
  max-width: 720px;
}

.content-with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.content-with-aside .main-content {
  min-width: 0;
  min-width: 520px;
}

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

.faq-list-section h2,
.troubleshoot-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.faq-list-section h2::before,
.troubleshoot-section h2::before {
  content: "// ";
  color: var(--color-accent);
}

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

.faq-item details {
  padding: 0;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: background-color var(--transition);
}

.faq-item summary:hover {
  background-color: rgba(76, 175, 80, 0.04);
}

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

.faq-item summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 20px 16px 44px;
  font-size: 14px;
  color: #555;
}

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

.faq-answer p:last-child {
  margin-bottom: 0;
}

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

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

.troubleshoot-card {
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.troubleshoot-card::before {
  content: "> ";
  color: var(--color-warn);
  font-family: var(--font-mono);
  font-weight: 700;
}

.troubleshoot-card p {
  font-size: 14px;
  color: #555;
  margin-bottom: 8px;
}

.troubleshoot-card a {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
}

.troubleshoot-card a::after {
  content: " →";
}

.faq-figure {
  margin-top: 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-figure img {
  aspect-ratio: 16 / 5;
}

.faq-figure figcaption {
  padding: 10px 14px;
  background-color: var(--color-panel);
}

/* ============================================================
   Pages · 合作流程（cooperation）
   ============================================================ */

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

.cooperation-steps {
  margin-bottom: 48px;
}

.cooperation-steps h2,
.consult-guide h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.cooperation-steps h2::before,
.consult-guide h2::before {
  content: "// ";
  color: var(--color-accent);
}

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

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

.step-card .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-ink);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: #555;
  margin-bottom: 12px;
}

.step-detail {
  background-color: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.step-detail h4 {
  font-size: 13px;
  color: var(--color-accent-dark);
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.step-detail h4::before {
  content: "$ ";
}

.step-detail ul li {
  font-size: 13px;
  color: #666;
  padding-left: 14px;
  position: relative;
  margin-bottom: 4px;
}

.step-detail ul li::before {
  content: "-";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.consult-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.consult-content p {
  color: #555;
  margin-bottom: 16px;
}

.guide-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guide-list li a {
  display: block;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background-color: var(--color-paper);
  color: var(--color-ink);
  transition: all var(--transition);
}

.guide-list li a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
  background-color: rgba(76, 175, 80, 0.04);
}

.guide-list li a::before {
  content: "$ ";
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

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

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

/* ============================================================
   Pages · 404
   ============================================================ */

.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 24px;
}

.error-panel {
  background-color: var(--color-terminal-bg);
  border-radius: var(--radius);
  padding: 40px;
  max-width: 560px;
  width: 100%;
  text-align: left;
  font-family: var(--font-mono);
  color: var(--color-terminal-text);
}

.error-code {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.error-code::before {
  content: "$ ";
  color: var(--color-muted);
}

.error-panel h1 {
  color: var(--color-paper);
  font-size: 20px;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 24px;
  line-height: 1.7;
}

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

.error-panel .btn-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.error-panel .btn-secondary {
  color: var(--color-paper);
  border-color: var(--color-muted);
}

.error-panel .btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: transparent;
}

.error-tip {
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid #333;
  padding-top: 16px;
}

.error-tip::before {
  content: "// ";
  color: var(--color-accent);
}

/* ============================================================
   Responsive · 响应式
   ============================================================ */

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

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

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

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

  .hero-inner {
    gap: 32px;
  }

  .hero-copy h1 {
    font-size: 30px;
  }
}

@media (max-width: 900px) {
  .layout-shell {
    grid-template-columns: 1fr;
  }

  .layout-shell .main-content,
  .content-with-aside .main-content {
    min-width: 0;
  }

  .help-panel {
    margin-top: 24px;
  }

  .help-panel-inner {
    position: static;
  }

  .content-with-aside {
    grid-template-columns: 1fr;
  }

  .content-with-aside aside.help-panel {
    order: 2;
  }

  .service-detail-grid {
    grid-template-columns: 1fr;
  }

  .industry-intro {
    grid-template-columns: 1fr;
  }

  .consult-guide {
    grid-template-columns: 1fr;
  }

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

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

  .scene-gallery {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

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

@media (max-width: 768px) {
  :root {
    --space-section: 48px;
  }

  .header-inner {
    height: auto;
    min-height: var(--header-h);
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 8px;
  }

  .main-nav.site-nav {
    order: 3;
    width: 100%;
    flex-basis: 100%;
  }

  .main-nav.site-nav ul {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
    width: 100%;
  }

  .main-nav.site-nav a {
    padding: 10px 8px;
    text-align: center;
    font-size: 13px;
  }

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

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

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

  .hero-copy h1 {
    font-size: 24px;
  }

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

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

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

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

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

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

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

  .breadcrumb {
    font-size: 12px;
  }

  .breadcrumb-sep {
    margin: 0 4px;
  }

  .selector-options {
    flex-direction: column;
  }

  .selector-option {
    text-align: left;
  }

  .method-step-head {
    flex-wrap: wrap;
  }

  .progress-item {
    grid-template-columns: 20px 1fr;
    gap: 12px;
  }

  .progress-marker {
    width: 20px;
    height: 20px;
  }

  .progress-item::before {
    left: 9px;
  }

  .error-actions {
    flex-direction: column;
  }

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

  .error-panel {
    padding: 28px 20px;
  }

  .error-code {
    font-size: 36px;
  }
}

@media (max-width: 480px) {
  .main-nav.site-nav ul {
    grid-template-columns: repeat(2, 1fr);
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  .site-notice p {
    padding: 8px 16px;
    font-size: 12px;
  }

  .section-heading h2 {
    font-size: 20px;
  }

  .terminal-body {
    padding: 16px;
    font-size: 13px;
  }

  .terminal-body h2 {
    font-size: 15px;
  }

  .service-card-header {
    flex-wrap: wrap;
  }

  .service-name {
    font-size: 16px;
  }

  .faq-item summary {
    padding: 14px 16px;
    font-size: 14px;
  }

  .faq-answer {
    padding: 0 16px 14px 36px;
  }

  .consult-guide {
    padding: 20px 16px;
  }

  .step-card {
    padding: 16px;
  }

  .page-title-area {
    font-size: 15px;
  }

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

/* 滚动渐显动画（增强，初始可见） */
@media (prefers-reduced-motion: no-preference) {
  .capability-item,
  .service-card,
  .process-step,
  .step-card,
  .method-step,
  .result-card,
  .troubleshoot-card {
    animation: fade-up 0.3s ease both;
  }

  @keyframes fade-up {
    from {
      opacity: 0.4;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}