/* ==========================================================================
   吃瓜718 企业官网 · 全站样式表
   视觉方向：服务交付路线 · 物流运营风
   配色：深蓝 #1F3A5F / 暖橙 #E67E22 / 墨绿 #2E7D32 / 警示红 #C62828
   ========================================================================== */

/* ==========================================================================
   Base — 基础变量、重置、字体
   ========================================================================== */

:root {
  --color-primary: #1F3A5F;
  --color-primary-light: #2C4E7A;
  --color-primary-dark: #162B47;
  --color-accent: #E67E22;
  --color-accent-dark: #C96A1A;
  --color-success: #2E7D32;
  --color-success-light: #E8F5E9;
  --color-danger: #C62828;
  --color-bg: #F4F6F8;
  --color-surface: #FFFFFF;
  --color-text: #263238;
  --color-text-light: #546E7A;
  --color-text-muted: #78909C;
  --color-border: #E0E6EC;
  --color-border-dark: #B0BEC5;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Mono", "Roboto Mono", Consolas, "Courier New", monospace;

  --container-wide: 1200px;
  --container-inner: 1100px;
  --header-height: 64px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --transition: 0.2s ease;
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0;
}

/* 辅助隐藏 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ---------- 页头 ---------- */

.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

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

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

.brand-link:hover {
  color: inherit;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.5px;
  line-height: 1.2;
}

.brand-tagline {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.3;
  white-space: nowrap;
}

/* ---------- 主导航 ---------- */

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

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

.nav-list li {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-sm);
  line-height: 1.4;
  white-space: nowrap;
  transition: background-color var(--transition), color var(--transition);
}

.nav-link:hover {
  color: #FFFFFF;
  background-color: rgba(255, 255, 255, 0.12);
}

.nav-link.is-current {
  color: #FFFFFF;
  background-color: var(--color-accent);
  font-weight: 600;
}

/* 移动端汉堡按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.menu-toggle .menu-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #FFFFFF;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.78);
  margin-top: 0;
}

.footer-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 48px 24px 28px;
}

.footer-brand {
  max-width: 360px;
  margin-bottom: 32px;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
}

.footer-links-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}

.footer-links-col h3 {
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 14px;
}

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

.footer-links-col a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  line-height: 1.6;
}

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

.footer-legal {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  margin-top: 8px;
}

.footer-legal p {
  font-size: 12px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 6px;
}

.footer-legal .copyright {
  margin-bottom: 0;
}

/* ---------- 内页通用骨架 ---------- */

.inner-main {
  max-width: var(--container-inner);
  margin: 0 auto;
  padding: 32px 24px 64px;
  width: 100%;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border-dark);
}

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

.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
}

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

.page-heading .page-intro,
.page-intro {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 760px;
}

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

/* ---------- 按钮 ---------- */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-accent);
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: transparent;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
  cursor: pointer;
  transition: background-color var(--transition);
}

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

.btn-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ---------- 卡片链接 ---------- */

.card-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 12px;
  transition: color var(--transition);
}

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

.text-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-border-dark);
  padding-bottom: 2px;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ---------- 图片容器 ---------- */

figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-top: 10px;
  text-align: center;
}

/* ---------- 相关链接（内页底部） ---------- */

.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.related-links-item {
  font-size: 13px;
  color: var(--color-primary);
  padding: 6px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ==========================================================================
   Components — 首页模块
   ========================================================================== */

/* ---------- 首屏双通道 ---------- */

.hero-section {
  background-color: var(--color-primary);
  padding: 56px 0 64px;
}

.hero-container {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.hero-intro {
  padding-top: 8px;
}

.hero-intro h1 {
  font-size: 32px;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-figure img {
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.hero-figure figcaption {
  color: rgba(255, 255, 255, 0.6);
}

.hero-quick-links {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.quick-title {
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.quick-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.quick-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 10px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

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

/* ---------- 通用区块容器 ---------- */

.section-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 56px 24px;
}

.section-inner h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-light);
  max-width: 720px;
  margin-bottom: 36px;
}

/* ---------- 服务定位与核心能力 ---------- */

.positioning-section {
  background-color: var(--color-surface);
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

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

.capability-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-border-dark);
}

.capability-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
}

.capability-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
}

/* ---------- 业务场景入口 ---------- */

.scenario-entry-section {
  background-color: var(--color-bg);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

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

.scenario-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-accent);
}

.scenario-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}

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

/* ---------- 方案演示与实施对照 ---------- */

.route-comparison-section {
  background-color: var(--color-surface);
}

.route-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.route-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.route-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-primary-light);
}

.route-figure {
  margin-bottom: 16px;
}

.route-figure img {
  border-radius: var(--radius-sm);
}

.route-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.route-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  flex-grow: 1;
}

/* ---------- FAQ 摘要 ---------- */

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

.faq-summary-list {
  max-width: 820px;
  margin-bottom: 24px;
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}

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

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

.faq-item p {
  padding: 0 20px 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
}

/* ---------- 合作流程 ---------- */

.cooperation-section {
  background-color: var(--color-surface);
}

.cooperation-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 40px;
  counter-reset: step-counter;
}

.step-item {
  position: relative;
  padding-top: 44px;
}

.step-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-border);
  border-radius: 2px;
}

.step-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40%;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.step-num {
  position: absolute;
  top: -14px;
  left: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
  z-index: 1;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ==========================================================================
   Components — 功能介绍页
   ========================================================================== */

.feature-overview {
  margin-bottom: 48px;
}

.section-heading {
  margin-bottom: 20px;
}

.section-heading h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 14px;
  color: var(--color-text-light);
  max-width: 680px;
}

.feature-overview-figure img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 48px;
}

.feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
  border-color: var(--color-border-dark);
}

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

.feature-card-head h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
}

.feature-tag {
  display: inline-block;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(230, 126, 34, 0.1);
  border: 1px solid rgba(230, 126, 34, 0.25);
  border-radius: 20px;
  white-space: nowrap;
}

.feature-definition {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 8px;
}

.feature-detail {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.feature-example {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-success);
  padding: 12px 16px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 10px;
}

.feature-audience {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.feature-audience::before {
  content: "适用对象：";
  font-weight: 600;
  color: var(--color-primary-light);
}

/* ---------- 下一步入口 ---------- */

.next-steps {
  margin-bottom: 40px;
}

.next-steps > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.next-steps > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.next-step-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

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

.next-step-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-accent);
}

.next-step-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.next-step-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ==========================================================================
   Components — 应用场景页
   ========================================================================== */

.scenario-guide {
  margin-bottom: 48px;
}

.scenario-guide h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.scenario-guide > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 720px;
}

.guide-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

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

.guide-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

/* ---------- 场景列表 ---------- */

.scenario-list {
  margin-bottom: 48px;
}

.scenario-list > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.scenario-item {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 24px;
}

.scenario-text h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.scenario-text p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.scenario-text p strong {
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 6px;
}

.scenario-figure img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.scenario-figure figcaption {
  font-size: 12px;
}

/* ---------- 场景匹配 ---------- */

.scenario-match {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin-bottom: 48px;
}

.scenario-match > h2 {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 10px;
}

.scenario-match > p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 28px;
  max-width: 680px;
}

.match-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.match-item {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  padding: 24px;
}

.match-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.match-item p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
}

.match-tip {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}

.match-tip a {
  color: var(--color-accent);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.match-tip a:hover {
  border-bottom-color: var(--color-accent);
}

/* ---------- 场景页下一步 ---------- */

.scenario-list + .next-steps {
  display: none;
}

.next-steps[aria-label="下一步入口"] {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 0;
}

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

.next-card:hover {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  border-color: var(--color-accent);
}

.next-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.next-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

/* ==========================================================================
   Components — 方案演示页
   ========================================================================== */

.usage-license-block {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 48px;
}

.usage-license-block h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.usage-intro p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.license-list {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.license-item {
  position: relative;
  padding: 10px 0 10px 28px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
  border-bottom: 1px dashed var(--color-border);
}

.license-item:last-child {
  border-bottom: none;
}

.license-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 8px;
  height: 8px;
  background-color: var(--color-success);
  border-radius: 50%;
}

/* ---------- 预览步骤 ---------- */

.preview-steps-block {
  margin-bottom: 48px;
}

.preview-steps-block > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.preview-steps-block > .section-desc {
  margin-bottom: 32px;
}

.preview-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.preview-step:last-child {
  border-bottom: none;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  border-radius: 50%;
  margin-top: 2px;
}

.step-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.step-content > p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
  margin-bottom: 14px;
}

.step-figure img {
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.step-figure figcaption {
  font-size: 12px;
  text-align: left;
}

/* ---------- 获取方式 ---------- */

.next-steps-block {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  margin-bottom: 24px;
}

.next-steps-block h2 {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.next-steps-content > p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 24px;
  max-width: 680px;
}

.step-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.step-link-card {
  display: block;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: background-color var(--transition), border-color var(--transition);
}

.step-link-card:hover {
  background-color: rgba(255, 255, 255, 0.14);
  border-color: var(--color-accent);
}

.step-link-title {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.step-link-desc {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.68);
}

/* ==========================================================================
   Components — 部署实施页（侧栏布局）
   ========================================================================== */

.page-layout {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 侧栏布局：aside 在前，main 在后 */
.sidebar-left {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
  align-items: start;
}

.sidebar-left .impl-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  padding: 32px 0 0;
}

.sidebar-left .inner-main {
  max-width: none;
  padding: 32px 0 64px;
}

.impl-sidebar {
  min-width: 0;
}

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

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--color-accent);
}

.sidebar-nav {
  margin-bottom: 20px;
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-list li {
  margin: 0;
}

.sidebar-list a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.sidebar-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
  border-left-color: var(--color-border-dark);
}

.sidebar-note {
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.sidebar-note p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ---------- 实施阶段正文 ---------- */

.impl-hero-figure {
  margin-bottom: 40px;
}

.impl-hero-figure img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.impl-stage {
  margin-bottom: 48px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.impl-stage > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.impl-stage > h2::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 22px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin-right: 10px;
  vertical-align: -3px;
}

.stage-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 20px;
  max-width: 680px;
}

.stage-detail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

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

.detail-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.detail-item p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.stage-check {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
}

.stage-check h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-success);
  margin-bottom: 10px;
}

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

.check-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--color-success);
  border-radius: 2px;
}

/* ---------- 实施页下一步 ---------- */

.next-entry {
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 24px;
}

.next-entry h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.next-entry > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.entry-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.entry-link {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  transition: border-color var(--transition), color var(--transition);
}

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

/* ==========================================================================
   Components — 帮助中心页
   ========================================================================== */

.help-intro {
  margin-bottom: 28px;
}

.help-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 760px;
}

/* ---------- 决策阶段导航 ---------- */

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

.stage-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.stage-nav-list li {
  margin: 0;
}

.stage-nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: border-color var(--transition), color var(--transition), background-color var(--transition);
}

.stage-nav-list a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(230, 126, 34, 0.05);
}

/* ---------- FAQ 分区 ---------- */

.faq-stage {
  margin-bottom: 44px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.faq-stage > h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  padding-bottom: 10px;
  margin-bottom: 20px;
  border-bottom: 2px solid var(--color-border);
}

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

.faq-list .faq-item summary {
  font-weight: 600;
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 18px;
}

.faq-answer p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

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

/* ---------- 帮助引导图 ---------- */

.help-guide {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 48px;
}

.guide-text h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.guide-text p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-light);
}

.guide-figure img {
  border-radius: var(--radius-sm);
}

/* ---------- 关联术语 ---------- */

.related-terms {
  margin-bottom: 48px;
}

.related-terms > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.terms-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

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

.term-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.term-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-bg);
}

.term-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: 10px;
}

.term-card .term-example {
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 0;
}

/* ---------- 帮助页下一步 ---------- */

.next-steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

/* ==========================================================================
   Components — 咨询服务页
   ========================================================================== */

.consult-intro {
  margin-bottom: 40px;
}

.consult-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 760px;
  margin-bottom: 24px;
}

.consult-hero-image img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* ---------- 合作流程 ---------- */

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

.cooperation-process > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.cooperation-process > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  counter-reset: process-counter;
}

.process-step {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 20px 20px;
  counter-increment: process-counter;
}

.process-step::before {
  content: "0" counter(process-counter);
  position: absolute;
  top: -12px;
  left: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  padding: 0 6px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  border-radius: 4px;
}

.process-step h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ---------- 准备清单 ---------- */

.preparation-checklist {
  margin-bottom: 48px;
}

.preparation-checklist > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.preparation-checklist > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.checklist-items {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.checklist-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  position: relative;
  padding-left: 56px;
}

.checklist-item::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 22px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-success);
  border-radius: 4px;
}

.checklist-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.checklist-item p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ---------- 常见约定 ---------- */

.cooperation-conventions {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 48px;
}

.cooperation-conventions > h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.cooperation-conventions > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.conventions-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.conventions-list li {
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.conventions-list h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.conventions-list p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ---------- 下一步引导 ---------- */

.next-step-guide {
  margin-bottom: 24px;
}

.next-step-guide > h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.next-step-guide > p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.guide-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.guide-links li {
  margin: 0;
}

.guide-links a {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  transition: border-color var(--transition), color var(--transition);
}

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

/* ==========================================================================
   Components — 404 页
   ========================================================================== */

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

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

.error-code {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.error-actions {
  margin-bottom: 20px;
}

.error-help {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

/* ---------- 平板及以下 ---------- */

@media (max-width: 960px) {
  .capability-grid,
  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cooperation-steps,
  .process-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .scenario-figure {
    order: -1;
  }

  .terms-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .guide-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stage-detail {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar-left {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }
}

/* ---------- 移动端 ---------- */

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 12px;
  }

  .brand-tagline {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.18);
    padding: 0 16px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 0;
  }

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

  .site-nav .nav-link {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

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

  .site-nav.is-open {
    max-height: 480px;
  }

  .site-nav .nav-list {
    display: none;
  }

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

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

  .hero-container {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 16px;
  }

  .hero-intro h1 {
    font-size: 26px;
  }

  .hero-lead {
    font-size: 14px;
  }

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

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

  /* 通用区块 */
  .section-inner {
    padding: 40px 16px;
  }

  .section-inner h2 {
    font-size: 21px;
  }

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

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

  .cooperation-steps,
  .process-steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .step-item {
    padding-top: 36px;
  }

  .step-num {
    top: -12px;
  }

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

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

  .page-heading .page-intro,
  .page-intro {
    font-size: 14px;
  }

  /* 侧栏布局：手机端主内容在前 */
  .sidebar-left {
    display: flex;
    flex-direction: column;
    padding: 0 16px;
  }

  .sidebar-left .inner-main {
    order: 1;
    padding: 24px 0 48px;
  }

  .sidebar-left .impl-sidebar {
    order: 2;
    position: static;
    padding: 0 0 24px;
    width: 100%;
  }

  .sidebar-inner {
    padding: 20px;
  }

  .sidebar-nav {
    margin-bottom: 12px;
  }

  .sidebar-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }

  .sidebar-list a {
    padding: 10px 12px;
    font-size: 13px;
  }

  .sidebar-note {
    display: none;
  }

  /* 实施阶段 */
  .impl-hero-figure {
    margin-bottom: 32px;
  }

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

  .stage-check {
    padding: 16px;
  }

  /* 功能介绍 */
  .feature-card {
    padding: 20px;
  }

  .feature-card-head {
    flex-wrap: wrap;
    gap: 8px;
  }

  .feature-example {
    padding: 10px 14px;
  }

  .next-step-cards,
  .entry-links,
  .step-links {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 场景页 */
  .guide-cards,
  .match-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .scenario-item {
    padding: 20px;
  }

  .scenario-match {
    padding: 28px 20px;
  }

  .match-tip {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .next-steps[aria-label="下一步入口"] {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 演示页 */
  .usage-license-block {
    padding: 24px 20px;
  }

  .preview-step {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 20px 0;
  }

  .step-number {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .next-steps-block {
    padding: 28px 20px;
  }

  /* 帮助页 */
  .stage-nav-list {
    gap: 8px;
  }

  .stage-nav-list a {
    padding: 8px 14px;
    font-size: 13px;
  }

  .help-guide {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 20px;
  }

  .terms-grid,
  .next-steps-grid,
  .conventions-list,
  .checklist-items {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 咨询页 */
  .cooperation-process > h2,
  .preparation-checklist > h2,
  .cooperation-conventions > h2 {
    font-size: 20px;
  }

  .cooperation-conventions {
    padding: 24px 20px;
  }

  .checklist-item {
    padding-left: 48px;
  }

  .checklist-item::before {
    left: 16px;
  }

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

  /* 页脚 */
  .footer-inner {
    padding: 40px 16px 24px;
  }

  .footer-links-group {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 32px;
  }

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

  .error-title {
    font-size: 22px;
  }
}

/* ---------- 超小屏 ---------- */

@media (max-width: 480px) {
  .brand-name {
    font-size: 19px;
  }

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

  .hero-quick-links {
    padding: 16px;
  }

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

  .section-desc {
    font-size: 14px;
  }

  .inner-main {
    padding: 20px 14px 40px;
  }

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

  .breadcrumb {
    font-size: 12px;
    gap: 6px;
  }

  .sidebar-left {
    padding: 0 14px;
  }

  .sidebar-left .inner-main {
    padding: 20px 0 40px;
  }

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

  .feature-card {
    padding: 18px 16px;
  }

  .scenario-item {
    padding: 16px;
    gap: 16px;
  }

  .usage-license-block {
    padding: 20px 16px;
  }

  .license-item {
    padding-left: 24px;
  }

  .next-steps-block {
    padding: 24px 16px;
  }

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

  .faq-item p {
    padding: 0 16px 14px;
    font-size: 13px;
  }

  .footer-links-group {
    gap: 20px;
  }
}

/* ---------- 滚动出现动画（增强，不影响初始可见性） ---------- */

@media (prefers-reduced-motion: no-preference) {
  .capability-card,
  .scenario-card,
  .route-card,
  .step-item,
  .feature-card,
  .scenario-item,
  .preview-step,
  .term-card,
  .checklist-item {
    transition: box-shadow var(--transition), border-color var(--transition),
      transform 0.3s ease;
  }

  .capability-card:hover,
  .scenario-card:hover,
  .route-card:hover,
  .step-item:hover,
  .feature-card:hover,
  .scenario-item:hover,
  .preview-step:hover,
  .term-card:hover,
  .checklist-item:hover {
    transform: translateY(-2px);
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}