/* ==========================================================================
   51黑料网 · 整站样式表
   版本：v1.1
   说明：本文件为全站唯一样式来源，覆盖首页、内页、404 页全部模块。
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   Base —— 变量、重置、基础排版
   ========================================================================== */

:root {
  --color-primary: #16324f;
  --color-primary-dark: #0f2438;
  --color-primary-light: #1d3f63;
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-warning: #f0a03c;
  --color-warning-bg: #fdf3e3;
  --color-danger: #c94f3d;
  --color-text: #24303c;
  --color-text-secondary: #6b7a89;
  --color-border: #e3e8ee;
  --color-border-dark: #cdd6df;

  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 13px;
  --font-size-h1: 28px;
  --font-size-h2: 22px;
  --font-size-h3: 18px;
  --line-height-base: 1.75;
  --line-height-heading: 1.4;

  --container-wide: 1200px;
  --container-narrow: 880px;
  --radius-card: 8px;
  --radius-small: 4px;
  --shadow-card: 0 1px 3px rgba(22, 50, 79, 0.08), 0 4px 12px rgba(22, 50, 79, 0.04);
  --shadow-card-hover: 0 4px 8px rgba(22, 50, 79, 0.1), 0 10px 24px rgba(22, 50, 79, 0.08);
  --transition-base: 0.2s ease;
  --header-height: 72px;
}

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

html {
  font-size: var(--font-size-base);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

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

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

a:hover {
  color: var(--color-primary-light);
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  margin-bottom: 0.75em;
}

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

figure {
  margin: 0;
}

/* ==========================================================================
   Layout —— 全站骨架：页头、页脚、面包屑、主容器
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

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

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

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

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

.site-nav {
  display: block;
}

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: rgba(22, 50, 79, 0.06);
}

.nav-list a.is-current {
  color: var(--color-primary);
  background-color: rgba(22, 50, 79, 0.08);
  font-weight: 600;
}

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

.nav-list .nav-notice::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-warning);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  cursor: pointer;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container-wide);
  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: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  color: var(--color-border-dark);
  user-select: none;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: var(--font-size-h1);
  color: var(--color-text);
  margin-bottom: 12px;
}

.page-description {
  max-width: 720px;
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: var(--line-height-base);
}

/* 页脚 */
.site-footer {
  flex-shrink: 0;
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 64px;
}

.footer-columns {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 56px 24px 40px;
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-about p:last-child {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 360px;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 16px;
}

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

.footer-links ul a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 24px;
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
  margin-bottom: 4px;
}

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

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

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

.section-heading h2 {
  font-size: var(--font-size-h2);
  color: var(--color-text);
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 640px;
}

.section-title {
  font-size: var(--font-size-h2);
  margin-bottom: 24px;
}

.section-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 720px;
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  max-width: 640px;
}

.section-footer-link {
  margin-top: 32px;
  text-align: center;
}

.section-footer-link a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 20px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.section-footer-link a:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 警示信息条 */
.alert-item {
  display: flex;
  gap: 12px;
  background-color: var(--color-warning-bg);
  border-left: 4px solid var(--color-warning);
  padding: 16px 20px;
  border-radius: var(--radius-card);
}

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

.alert-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}

/* 内容图片 */
.content-figure {
  margin: 24px 0;
}

.content-figure img {
  width: 100%;
  border-radius: var(--radius-card);
}

.content-figure figcaption {
  padding: 10px 4px 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-align: center;
}

.content-media {
  margin: 24px 0;
}

.content-media img {
  width: 100%;
  border-radius: var(--radius-card);
}

.content-media figcaption {
  padding: 10px 4px 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-align: center;
}

.content-media-inline {
  margin: 24px 0;
}

.content-media-inline img {
  width: 100%;
  border-radius: var(--radius-card);
}

.content-media-inline figcaption {
  padding: 10px 4px 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-align: center;
}

/* 相关内容导航 */
.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 48px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.related-links-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  flex-shrink: 0;
}

.related-links-item {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  padding: 6px 12px;
  border-radius: var(--radius-small);
  background-color: rgba(22, 50, 79, 0.06);
  transition: background-color var(--transition-base);
}

.related-links-item:hover {
  background-color: rgba(22, 50, 79, 0.1);
}

/* ==========================================================================
   Pages —— 首页
   ========================================================================== */

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

/* 首屏 */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 64px;
}

.hero-content {
  min-width: 0;
}

.hero-text h1 {
  font-size: 32px;
  line-height: 1.35;
  margin-bottom: 16px;
  color: var(--color-text);
}

.hero-text > p {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-bottom: 32px;
}

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

.entry-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.entry-icon {
  font-size: 24px;
  line-height: 1;
}

.entry-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.entry-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.hero-media {
  position: relative;
}

.hero-media img {
  width: 100%;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

/* 通用区块 */
.section-block {
  margin-top: 64px;
}

.section-block + .section-block {
  margin-top: 64px;
}

/* 服务能力矩阵 */
.capability-overview {
  margin-top: 64px;
}

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

.service-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.service-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

.service-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}

.service-card a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
  display: inline-block;
}

/* 典型场景摘要 */
.scene-summary {
  margin-top: 64px;
}

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

.scene-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

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

.scene-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 24px;
}

.scene-body h3 {
  font-size: 18px;
  margin-bottom: 16px;
}

.scene-body p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.scene-body p strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 4px;
}

.scene-body a {
  margin-top: auto;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
  display: inline-block;
}

/* 研究方法摘要 */
.method-summary {
  margin-top: 64px;
}

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

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

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

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

.step-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 合作流程预览 */
.cooperation-preview {
  margin-top: 64px;
}

.cooperation-stages {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.stage-item {
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.stage-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.stage-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 问题分类引导 */
.question-guide {
  margin-top: 64px;
}

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

.question-group {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.question-group h3 {
  font-size: 17px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.question-group ul li {
  margin-bottom: 12px;
}

.question-group ul a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: inline-block;
  transition: color var(--transition-base);
}

.question-group ul a:hover {
  color: var(--color-primary);
}

/* 通知中心预览 */
.notice-preview {
  margin-top: 64px;
}

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

.notice-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.notice-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card);
}

.notice-item time {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  flex-shrink: 0;
  min-width: 88px;
}

.notice-item span {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
}

/* ==========================================================================
   Pages —— 服务能力（services.html）
   ========================================================================== */

/* 问题分类总览 */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

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

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

.category-card h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.category-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 服务模块列表 */
.module-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.module-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.module-item h3 {
  font-size: 16px;
  margin-bottom: 0;
}

.module-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.module-item p + p {
  margin-top: 8px;
}

/* 交付标准 */
.standard-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.standard-item {
  display: flex;
  gap: 12px;
  background-color: var(--color-warning-bg);
  border-left: 4px solid var(--color-warning);
  padding: 16px 20px;
  border-radius: var(--radius-card);
}

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

.standard-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}

/* 相关入口 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.related-card {
  display: block;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
}

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

.related-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ==========================================================================
   Pages —— 服务案例（cases.html）
   ========================================================================== */

/* 行业分类标签行 */
.industry-tabs {
  margin-bottom: 40px;
}

.tabs-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.tabs-row a {
  display: inline-block;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.tabs-row a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(22, 50, 79, 0.04);
}

/* 场景卡片 */
.case-list {
  display: flex;
  flex-direction: column;
  gap: 48px;
  margin-bottom: 48px;
}

.case-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.case-media figure {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.case-media img {
  width: 100%;
  border-radius: var(--radius-card);
}

.case-body h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

.case-block {
  margin-bottom: 20px;
}

.case-block h3 {
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.case-block p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 相关能力入口 */
.related-entry {
  margin-top: 48px;
}

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

.entry-grid .entry-card {
  display: block;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

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

.entry-grid .entry-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ==========================================================================
   Pages —— 研究方法（method.html）
   ========================================================================== */

/* 研究摘要 */
.method-summary .summary-content p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
  max-width: 780px;
}

/* 方法步骤 */
.method-steps-section {
  margin-top: 48px;
}

.method-steps-section .method-steps {
  gap: 24px;
}

.method-step {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.step-media {
  margin-bottom: 16px;
}

.step-media img {
  width: 100%;
  border-radius: var(--radius-card);
}

.method-step h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.method-step p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 进展记录 */
.method-progress {
  margin-top: 48px;
}

.progress-timeline {
  position: relative;
  margin-top: 32px;
}

.progress-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding-bottom: 32px;
  position: relative;
}

.progress-item::before {
  content: "";
  position: absolute;
  left: 60px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

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

.progress-year {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  padding-top: 4px;
  position: relative;
  z-index: 1;
}

.progress-year::after {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-primary);
  margin-top: 8px;
}

.progress-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px 24px;
  box-shadow: var(--shadow-card);
}

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

.progress-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* 公开成果 */
.method-outputs {
  margin-top: 48px;
}

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

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

.output-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.output-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.output-card p + p {
  margin-top: 8px;
}

/* ==========================================================================
   Pages —— 合作流程（cooperation.html）
   ========================================================================== */

/* 流程总览 */
.process-overview {
  margin-top: 48px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin: 32px 0;
}

.process-step {
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  text-align: center;
}

.process-step .step-num {
  margin: 0 auto 12px;
}

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

.process-step p {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 阶段详情 */
.phase-details {
  margin-top: 48px;
}

.phase-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-card);
}

.phase-block h3 {
  font-size: 17px;
  margin-bottom: 12px;
}

.phase-block p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.phase-block p strong {
  color: var(--color-text);
  font-weight: 600;
}

.phase-goal {
  font-size: var(--font-size-sm);
}

.phase-output {
  font-size: var(--font-size-sm);
}

/* 需求准备清单 */
.prep-list {
  margin-top: 48px;
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.checklist li::before {
  content: "";
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 2px solid var(--color-primary);
  border-radius: 4px;
  background-color: transparent;
}

/* 交付标准 */
.delivery-standard {
  margin-top: 48px;
}

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

/* 链接卡片 */
.link-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.link-card {
  display: block;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

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

.link-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ==========================================================================
   Pages —— 通知中心（notices.html）
   ========================================================================== */

/* 最新通知高亮 */
.notice-featured {
  margin-top: 48px;
}

.featured-notice-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-warning);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-top: 24px;
  box-shadow: var(--shadow-card);
}

.notice-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.notice-headline {
  font-size: 18px;
  margin-bottom: 12px;
}

.notice-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.notice-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
}

/* 日期分组列表 */
.notice-archive {
  margin-top: 48px;
}

.notice-group {
  margin-bottom: 40px;
}

.group-date {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.notice-group .notice-list {
  gap: 8px;
}

.notice-group .notice-item {
  padding: 14px 16px;
}

.item-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  flex-shrink: 0;
  min-width: 88px;
}

.item-link {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
  transition: color var(--transition-base);
}

.item-link:hover {
  color: var(--color-primary);
}

/* 归档链接 */
.archive-access {
  margin-top: 48px;
}

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

.archive-link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.archive-year {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
}

.archive-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.archive-tag {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--color-primary);
  background-color: rgba(22, 50, 79, 0.06);
  padding: 4px 10px;
  border-radius: var(--radius-small);
  margin-top: 8px;
}

/* ==========================================================================
   Pages —— 常见问题（faq.html）
   ========================================================================== */

.faq-group {
  margin-bottom: 48px;
}

.faq-group-title {
  font-size: var(--font-size-h2);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--transition-base);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform var(--transition-base);
}

.faq-item[open] summary {
  background-color: rgba(22, 50, 79, 0.04);
}

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

.faq-item summary:hover {
  background-color: rgba(22, 50, 79, 0.04);
}

.faq-answer {
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 0;
}

/* FAQ 相关链接 */
.faq-related {
  margin-top: 48px;
}

.faq-related-title {
  font-size: var(--font-size-h2);
  margin-bottom: 24px;
}

.faq-related .related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  background: transparent;
  border: none;
  padding: 0;
  margin-top: 0;
}

.faq-related .related-link {
  display: block;
  padding: 20px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.faq-related .related-link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

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

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

.error-content h1 {
  font-size: 24px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.error-tip {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

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

.error-btn {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base);
}

.error-btn:hover {
  background-color: var(--color-primary-light);
  color: #ffffff;
}

.error-link {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.error-link:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

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

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

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

  .cooperation-stages {
    grid-template-columns: repeat(3, 1fr);
    row-gap: 16px;
  }

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
    row-gap: 16px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-media {
    order: -1;
  }

  .hero-media img {
    max-height: 320px;
    object-fit: cover;
  }

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

  .case-media figure {
    position: static;
  }

  .case-media img {
    max-height: 280px;
    object-fit: cover;
  }

  .module-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

/* 手机：≤768px */
@media (max-width: 768px) {
  :root {
    --font-size-h1: 24px;
    --font-size-h2: 20px;
    --font-size-h3: 17px;
  }

  .header-inner {
    min-height: 60px;
    padding: 0 16px;
  }

  .brand-name {
    font-size: 19px;
  }

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

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(22, 50, 79, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
  }

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

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

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

  .nav-list a {
    display: block;
    padding: 14px 8px;
    font-size: 16px;
    border-radius: 0;
  }

  .nav-list a.is-current {
    background-color: transparent;
    border-left: 3px solid var(--color-primary);
    padding-left: 5px;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 32px;
  }

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

  .home-main {
    padding: 0 16px 48px;
  }

  .hero-section {
    padding: 32px 0 40px;
  }

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

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

  .capability-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .scene-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .method-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .question-groups {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .category-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .entry-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .outputs-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .link-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .archive-links {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .progress-item {
    grid-template-columns: 80px 1fr;
    gap: 16px;
  }

  .progress-item::before {
    left: 40px;
  }

  .notice-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .notice-item time {
    min-width: 0;
  }

  .breadcrumb {
    margin-bottom: 16px;
  }

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

  .section-block {
    margin-top: 40px;
  }

  .section-block + .section-block {
    margin-top: 40px;
  }

  .faq-related .related-links {
    grid-template-columns: 1fr;
  }

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

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

  .error-btn,
  .error-link {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

/* 小屏手机：≤480px */
@media (max-width: 480px) {
  .cooperation-stages {
    grid-template-columns: 1fr;
  }

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

  .step-item {
    padding: 20px;
  }

  .stage-item {
    padding: 16px;
  }

  .process-step {
    padding: 16px;
  }

  .case-card {
    padding: 20px;
  }

  .phase-block {
    padding: 20px;
  }

  .faq-item summary {
    padding: 16px 20px;
    font-size: 15px;
  }

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